[Clutch plate issues]

I need a 6.5 inch diameter, 20 spline clutch plate for my spitfire. everywhere does 10 spline 6.5" or 20 spline 7 1/4 but not the 20 spline 6.5 any suggestions please???

 

many thanks

[Help! Mystery Gearbox?]

I'm going to take it out of the box and see if there is a part no. Stamped on it, the. Il try mick cheers for that

[Help! Mystery Gearbox?]

I think it's fine spline and j type overdrive

[Help! Mystery Gearbox?]

It's single rail but I can't find a 18 tooth reverse idler any where, apparently they used to put a dolly box in and get a smaller input shaft made.

[Help! Mystery Gearbox?]

I have removed the gearbox from my mk4 1300 spitfire, the case no. is WH21445 alledgedly for a dolomite, however the chewed up reverse idler has 18 teeth not 17 can anyone explain? will a 17 do or is it likely form a midget/mini/any other british leyland car? what clutch friction plate would suit?