The consensus is that the ZF diffs are better than Quaiffe for Hillclimbs and Supersprints because they lock up better so you leave 2 black lines
instead of 1 : )

I bought a pair through Bruce Tweddle in Canada. He's a ZF expert. He gets the diffs from Mexico, reconditions them and only sells them to people who
race VWs.
I have one in my oval and love it. The other was for Jak's Superbug. But he's changed his mind and needs to free up the cash.
Originally cost $1650 from memory last year. For Sale $1200 + Shipping (A bargain)
Name Christian Hansen (CT)
Item location Mona Vale, NSW 2103
Contact me by PM or phone 0421 053 275
An absolute steal !
Best thing i ever bought for my car, and it would be great for a daily driver who wants to have an occasional car club or drag day event.
Cheers Col