I've not had my Sunbeam S7 clutch apart but these parts came with a load of other spares I got with it so I'm assuming they're Sunbeam but please check photos thanks
SUNBEAM S7 S8 REAR DRIVE Diff Differential Shaft Drive Box Housing OIL SEAL
SUNBEAM S7 S8 REAR DRIVE Diff Differential Shaft Drive Bevel Box Complete
SUNBEAM S7 S8 REAR DRIVE Diff Casing Differential Shaft Drive Box Housing
new pair JOHN BULL no.19 black rubber KNEE GRIPS prewar Sunbeam S7 S8
SUNBEAM S7 S8 (1947-56) DESIGN DEVELOPMENT & PRODUCTION HISTORY BOOK *HARDBACK*
An original instruction manual for Sunbeam S7 & S8 500 O.H.C. twin