Isuzu Dmax right side mirror.

Mick, answered your own question...........

I can't see why people are against the convex mirrors, they have been around for years, it is just a matter of getting yourself familiar with them.

My wifes Hyundai has had them since new and I don't think anything of diving her car or mine. In fact my D-Max has the Clearview mirrors and I find the convex section is great when wanting to see what is beside you.

Mick
Yes a piece of mirror cut to a pattern by a glazier is one solution, but the convex mirrors are ok'd for roadworthiness and good to use. Most people have their mirrors set far too high and able to check for low flying aircraft but cannot see the ground at rear of their vehicle to have a sensible perspective of distance with a convex mirror and so lose distance judging ability. If you can see the lower half of your caravan you must know the top half is still there so go low.
If you can see only the bottom half of a vehicle behind you, then you still know it is there, but seeing immediately at your rear markedly increases awareness and perception to the rear.
Mine are always set to see the trailer/van tyres and sometimes and with a bit more down even my own rear rear tyres. If not, a small amount of DOWN on the mirror control can be used to check tyre inflation while travelling. Easy to then check both sides and return to normal view. Flat mirror with eliminate a lot of possible vision and increase blind spots.
To increase reversing confidence, have mirrors adjusted at the lower level, once you get used to not seeing the tops of triple deck B doubles you will be safer. Try it and see. If maneouvering then you may need to UP the mirror vision for a short time when van is near overhanging buildings though.

I've done many mirror replacements like this over the years, a combination of being in the retail glass industry, and in the motor vehicle trades.

Yes, a template in paper can be taken, a new flat glass cut, arissed to shape nicely, and then neutral cure silicone into the backing . . . typically an old flat one the pieces (of a broken one) can be removed, the backing plastic frame cleaned up, and new glass glued in.

The edges (silver on the back) should be sealed with a clear spray, anything acrylic, there is a mirror edge sealer spray pack on the market.

Your old flat glass can be cut, removed, then the backing made suitable, by that I mean the backing plastic is probably curved too, ever so slightly, so this needs to be made suitable for the flat glass.
Generally a heat gun and some careful heating, flattening, should be good to go.

After the new glass is fitted to the mirror head, it needs to cure for a couple of days before refitting to the mount in the mirror.

Your plan to just silicone a new flat mirror onto the convex one CAN be done, might just be a bit more care required to ensure a high bead around the outer edge, it will sit more proud in the mirror though.
Once glued in place, a couple of alternating strips of 2" masking tape can hold in place for the drying time.

Neutral cure silicone is required, as it won't eat into the backing paint on the new mirror like acid cure will.
Give neutral cure 2 days to dry reasonably.

first thing i did with my bt50 ,(hate them for reversing a boat etc and nearly had an accident in a hire car on holiday ),just got it cut and used outdoor double sided tape ,the grey stuff from supercheap ,still on there after 9 years .

First thing I did to my Colorado after buying it new.
Hated the convex mirrors which as you said gives a false judgement of distance, especially when reversing, or passing someone else.
Took my vehicle to a Glass retailer, who broke the original mirror glass, then remounted the new flat mirror glass on the original backing. I overcame the left hand blind spot with the use of a cheap small round stick-on mirror which I placed in the upper right corner of the left hand mirror.

I really don't know how the convex mirrors ever passed the ADR requirements. They may give a broader view but at the detriment of distance judgement.
How many times have you been "astounded" by a vehicle "cutting in" too quickly after passing you. That in my opinion is way more dangerous than a broader view.

Another possible option. If the fitting of the convex mirror on the driver's side is a fairly new innovation for the Dmax it might be possible to get a replacement glass for the prior model from a Dealer (or Wrecker). I did that on a 100 series LandCruiser some years ago. The old one popped out easily, and the new one (flat glass obviously) went into the holder like a hand in a glove, and I have never looked back since (so to speak). Total cost was about $35.00 from memory.

Interesting to hear so many people not liking convex. All our recent vehicles have been convex on both sides - our 200series, the Troopy and my wife's Vitara turbo - I'm used to allowing for the extra distance and like the increased view. And we use rear view cameras so only pull back in when the front of the overtaken vehicle is in view.

Two years ago I changed the Troopy mirrors to a set of elephant ears towing mirrors but it was impossible couldn't get a good view out of the flat glass. I needed to see the top of the caravan, the tyre of the caravan as well as down the side and also minimise the blind spot for vehicles in the next lane. And the small convex mirror was pretty much useless.

So I ditched them and upgraded to the new MSA towing mirrors - large single convex mirror and the best mirror I've had - can see everything. I think a lot depends on the size of the mirror and a large slightly convex mirror is way better than a small very convex mirror.