Just had a quick look on servicebox and it appears that the only cars with a smaller diameter spline are the 1.1s and 1.3s
92 Cherry Red GRDT-Died in a car crash 17/09/06 RIP
92 3dr Goodwood GTI-Long term resto
92 Ming Blue GRDT-Also died in a car crash 17/12/08 RIP
90 Alpine White GRI-Bargain of the century at £20
92 Winchester Grey GRDT-On loan to a friend
93 5dr Goodwood GTI-Life threatening case of metal cancer
88 Pinewood Green Phase 1 3dr non sunroof GTI-plans to put in my turbo technics lump
88 Steel Grey SRI-another long term resto
89 Topaz Blue SRI-Lastest editon only 17k on the clock
I know the splines are slightly different on the 1.1/1.3/1.4s but I was wondering if Gti ones would be any stronger than the 1.9d ones I have fitted at the moment