G80CS piston numbers

[g80csp11]

Can anyone confirm the part numbers for G80CS short stroke engines . As I understand it for the parts books etc. there are 2 date changes
Is that correct?
I want to make sure i'm fitting the correct part to a 1961 G80CS

1956 - 1959
Complete piston assembly 022733
Bare piston 022350
Hepolite number 13380 or 14628
Alternative Robins Piston number M1025

1960 on wards
Complete piston assembly 026665 (CS)
Bare piston 026328 (CS)
Hepolite number 15710
Alternative Robins Piston number M1030

Bare piston 028196 (high compression ration 12:1)

Complete piston assembly 026770 (road model 7.3:1 comp ratio)
Bare piston 026769 (road model 7.3:1 comp ratio)


found link to Hepolite catalogue , plus other links not on the archive pages, worth checking out

http://bsa-info.nz/other-brands/