What ‘s the part number of CB clutch are you using? I guess maybe you used airflex CB clutch , Gummi CB clutch or OSI CB clutch, Rubflex CB clutch? are you confused to the part number from different manufactuers? Here are the PN from Rubflex and OSI for your reference.

Part number Between Rubflex CB Clutch and OSI CB Clutch
Rubflex OSI Rubflex OSI
6CB200 6A200 8CB250 8A250
10CB300 10A300 12CB350 12A350
14CB400 14A400 16CB500 16A500
18CB500 18A500 20CB500 20A500
24CB500 24A500 26CB525 26A525
28CB525 28A525 30CB525 30A525
40CB525 40A525 45CB525 45A525