Clutch advice please

[geoffp67]

I'm looking for a clutch release bearing, this may be a long story but please bear with me.
I may have boobed by buying the wrong clutch but hopefully someone will point me in the right direction.

I have a standard S12 engine and gearbox fitted in my Reliant Scimitar SS1.
It seems that the original clutch had a slightly thicker bearing than standard, at 22mm instead of 19mm.

I have two S12 NSK bearings: both TK40-4A, the standard item has individual letter E while on the thicker one that fell out of my car its J. Presumably there is a reason for this so it would matter if I fitted the thinner one ???

The clutch kit I bought is from an S13, friction and pressure plates fit without problems but the release bearing is a different design and wont rotate on the S12 carrier. Presumably this is from the later S13 as I understand that the early S13 ones fit directly.
Does anyone know if there is an alternative bearing I can use ? Or another way around it ?

The new clutch is Aisin CNS41076
also labelled on the box as KN-076
and
clutch kit CN402 DN059 BN006
The friction disc has 3 or4 big springs as opposed to 6 smaller ones on the original.

If I've got the wrong kit please let me know, I'll offer it for sale.

Thanks, Geoff.