alternate rear passenger bench seats for 80 series?

Thanks mate, I want to get a seat that has 3 lap sash seat belts because of the increased protection that the sash gives. In a front on collision the increased g-forces shoot the torso forwards placing that weight over the lower abdomen and back. This means that the incident of severe pelvic, spinal and internal organ injuries is much higher than when using a lap+sash belt. My main job is as an ambulance paramedic and I have attended lots of crashes - I just couldn't live with myself if one of my kids was badly injured or killed.
You can use a harness up til the wearer hits 36 kgs (about 12 years old) and after that things need to be looked at. Our kids are 12,10 and 8.

And they're fair enough points.
In your job your are right to believe that you can protect your Kids/wife, but without sounding to hash or cold, your driving an 18 year old vehicle, like I am.
Owning a vehicle is a compromise.
I wish I could afford all the safety features of a modern vehicle, but we can't, so I drive as best as I can to avoid the impossible, only time will time if I achieve this or not.
I also know that the price to have these installed is small compared to what your family is worth.
Please join Lcool, for these guys will be able to help you with fitting these belts.
Cheers, happy travels Simon and if you see us on the road gives a hoy.

Thanks Jon, I have joined Lcool (and thanks very much for the tip too!), I'll see what I can find out from them for sure.
The cars age is an issue and it is was only an issue of finances stopping me from getting a 100 series. I have seen enough wrecks to keep me driving safely and I am glad that the 80 series doesn't go like a rocket. I am hoping to teach my kids to drive in the cruiser rather than our Falcon figuring that despite its safety features it can give a false sense of security driving a car like that rather than a bus like the cruiser.
Thanks again - happy travels :-)

Thanks for that, I really appreciate that! I can use the normal anchor point until the smallest gets to 12 years old but from there it gets tricky. I spoke to an engineer locally specifically about the seats and my options start to get really, really expensive from there.
Thanks again :-)

I think I'e seen 60's with a bar across the cargo area just behind the back seats for child restraints, something similar but engineered for the load may do the job, I looked into this for a 1962 MGA that we own and Brown Davis were able to to do the job, Rhys.

Thanks maaaaaate! I really appreciate that :-)

Champion! Thanks very much Jeff, I really appreciate that mate. It's an awfully long way to drive to Dandenong, but I guess I'll just have to tuff it out and spend a few weeks travelling down there :-)

Might have to get a camper trailer and take my time getting there ;-)