all great info there luke, looking at the mk3 pas box and mk3 heavy duty box, the drop arms look very similar. i wonder have they the same tapered spline where they go onto the box?? i imagine a heavy duty burhman would be slightly more common than pas mk3,s
the reason i ask is while i done a lot of research on alternative pas boxes to fit to mk1/mk2,s the closest thing i could find was one from a jeep cheroke (would need to be from an lhd one mind) could be made to fit without too much chopping etc but it has a cranked drop arm which deffo wouldnt work, ..........but heres the interesting bit,....the mk3 pas drop arm will fit straight onto the cheroke spindle!! it has the identical 3 position master spline!
so i was thinking if the heavy duty arms are same as pas ones and not that scarce the jeep cheroke box mite be a viable option as theyre cheap to buy on the bay etc