Sprocket - TRE MK2 and Mk3 520 Chain

Bolt pattern:

6x 3/8" on 5.5" BCD with 4.75" ID For the TRE MK2 FSAE differential

8x 1/4" on 105mm BCD with 93mm ID For the TRE MK3 FSAE differential (12 bolt pattern, with 4 skipped holes)