BenSpoon replied:

I picked up the opposite lock battery tray for my dual batt as it came in a little cheaper than the genuine thing. The OL one came with an extra piece of metal bent up which would be easy to make.

It is a C- Channel piece about 20cm long, 5cm wide and 4cm deep. It has 2x holes drilled in each side- on one side you bolt it to those capive nuts on your car you mentioned- there are several (on both sides of the engine bay too), and on the other side of the C channel you bolt on your washer bottle. It just spaces it from the engine bay wall and acts as a seccure adaptor plate to bolt on to.

The heat has not been an issue- if you tuck it in behind the air box it stays cool. I have a bent up metal bar fixed to 2 capive nuts on the other side so there is complete airflow around the isolator, but I dont think its much of a problem anyway.

Member - DOZER replied:

Gday
The battery tray is from a 3f petrol 80 series here in oz, or some 80's in turbo diesel run dual batteries in europe and 24 volt starting.
Ok, the isolator needs to be on the body or similar...while the motor could house it, the motor moves around alot and the wires you run to and from the isolator will eventually fail from vibration. The heat at the back of the bay will be hotter than the front, i suggest drilling two holes in that new shroud, where minimal length cable can be ran from both batteries to the isolator.
The water bottle is usually placed further back (behind the aircleaner) on thesame side...you only pick up one bolt hole at the front end unless you go to ARB and buy a special bracket to hold it firmer....my mate has his there and it was fitted there from Toyota as new...when he got them to put in a dual battery. (They only used the one bolt and it hasnt failed in 11 years/220kms)
Andrew

Alloy c/t replied:

DustyM ,. methinks you got the radiator overflow and washer bottle mixed up /ar-e about ...when fitting the standard 80series lefthand [facing the engine from front of vehicle] aux battery tray all you have to shift/move is the radiator overflow bottle ,mount the tray with the bolts into the already there mounting holes ,radiator overflow bottle then slides back into its original mount next to radiator ,,,, as for mounting the solenoid ,,best to mount onto body ,,NOT onto engine itself .

Hairy replied:

I picked up another washer bottle from repco for about $15 and mounted it on the passenger side near that carbon filter ther is even a second washer motor there you can use for power.