BSA A7, A10, B31, B33, M20 and M21 models fitted with telescopic forks.
Pre 1971 BSA A50 and A65 models.
Bearing 1: External diameter: 54mm (2.127") Internal diameter: 28.49mm (1.12")
Bearing 2: External diameter: 54mm (2.127") Internal diameter: 30.14mm (1.186")
This Bearing kit will fit swinging-arm models without any modification.