Inner CV-joint sizes

[WidowmakerS2]

I have a worn inner cv-joint at the back.
The joints are from a CQ 20v, with 20v flanges on a S2 diff.

I'm having difficulties sourcing the correct CV-joint.

I'm sure the S2 has 108mm inner joints, but I'm not certain the 20v had 100mm's.

If I can use 100mm's, will a front joint from a 80 fit, or is this different sized splines?

[WidowmakerS2]

Can anyone be bothered to check with KATE?

[|CL|NIKI]

CQ 20v have nothing same with S2 - CV's, axles,hubs, bearing holders all.....
Everything at CQ 20v is smaller than S2.
S2 diff is with 108mm inner bells, CQ is with smaller - 100 or even 98mm. But they are interchangeable.
Axles splines are different too.

[WidowmakerS2]

Thanks for your reply.

Although I've found many of the componenets similar and interchangable, the inner joints are a mystery still.

I know for a fact that the late 20v models had the same wheel bearings and carriers up front, but smaller at the rear. The trouble is that Audi used different components on the production line of the 20v's.

As i said, i have a S2 diff with 20v axle flanges. This works just fine.
Should I go for the 100mm one?