Listers, Moss lists three different clutch release bearings for the 6 cylinders. 501-022 BN4, BN6 501-020 BN7, BT7, BJ7 to 29F-H4878 501-032 BJ7 from 29F-H4879, BJ8 I have a new bearing - how can I identify which application it's for? I know that one of the differences is the thickness - from the pivot to the front face (of the holder). Bob