Thats really interessting, are you 100% sure? Ive got a customer car there with same length axles. I cant imagine that I have one of that rare helical R34 GTT diffs here.
The diff what is mounted (i believe its an aftermarket inside) locks so much that the tires rubbs on slightly corners, almost like welded. Its really uncomfortable to drive on the road with it. So I want to mount a Kaaz 1.5 SQ, but I dont want to order twice. If you are 100% sure that Helicals have the same length, I would order that version 😃