I purchased a clutch release bearing from AutoRicambi and later realised it was made of plastic whilst the original was an all metal construction.
I set out looking for an all metal bearing and found that International-Auto sells the all metal ones.
The part I received is an CORAM C0013. I also found that it interchanges with quite a few different part numbers.
VALEO - 264969
SACHS - 1850282127
TIMKEN - FI1709C
FIAT - 5954175
FIAT - 4409889
FIAT - C4901
FIAT - 5888486
FIAT - 4156829
FIAT - 4237218
FIAT - 4316750
FIAT - 4327218
FIAT - 4207838
FIAT - 4156828
FIAT - 4305532
Sachs actually puts it into a complete clutch kit KF292-03.