What other gearboxes could I use with a gripper diff?

[Robin]

As my Polo is purely for track usage and gearboxes aren't lasting too well I am wondering what other gearbox codes I can use along with my gripper diff? I am not massively fussed over gear ratios.

[Nick_S]

You are fairly limited with direct fit tbh but ceh, cek and late ceg will do. 6N gearboxes in theory can work but there is no counter sunk shamfer on the gripper housing to allow the phosphor bronze thrust washers you get on the 6n onwards boxes!