Derailleur pulleys with ring bearings Elvedes Spacer

Derailleur pulley kit (2x 10 teeth) mounted on ABEC 3 sealed ring bearings, delivered with several sets of specific spacers compatible:

A/ Shimano 8 speeds

B/ Shimano 7 speeds and Campagnolo 8 speeds

C/ Campagnolo 9/10 speeds

D/ for all Sram 7.0/9.0 from 1997 to 1999 / 9.0 SL (98)/ 5.0 (98/99)