Do you know what the differences were exactly? The revised mounting points for 8/9 degree trailing arms weren't used on road cars.

I was aware that they had moved to the different front ARB ( H14 type ) by then to give an extra degree of caster but I thought the later 3-doors had those on as well? Or were the non-RS500 3-doors that had them fitted all retro-fitted rather than in production?

I know that some dealerships changed 3-doors to the later front hubs to reduce 'straight-line nervousness' but only ever heard of it being done at customer insistance on cars that had already been sold.

The pre-release 3-doors had solid plastic inner TCA bushes and different gearing on the TRW steering rack gears but they changed them for mainline production after unfavourable reception from journalists on the launch.