IanT
I made it about 18 years ago when I still had my Sani!! I transferred it to the Terrano and at the same time also used it in my two previous Patrols. It is now in my 3rd Patrol.
It is the 800mm long heavy duty units you buy from Furnlock & Slide in Wynberg (could be Eastgate Industrial) just off Marlboro drive here in Jhb.
See here:
http://www.furnlock.co.za/product/7330-heavy-duty-90kg/
The ones for the Ammo boxes is the 800mm medium duty version, also supplied by them if I remember correctly. I just went to Rochas Building supplies in Lorentzville and ordered it through Vic. Sergio will also know what to get. The HD unit is about 20mm thick. I did not have all that space for the Ammo box slides, so I had to fit the narrower 12mm thick units.