WTD 13 tooth semi helical pinion gear
Turbo Mini Forums

Long shot, but I've bought a quaife diff which came with a 4.3 semi helical cwp 56/13 tooth. The pinion could be better, but can't find any company that sells the 4.3 anymore. Annoyingly there's nothing on the cwp that identifies where it's from, and I don't know the cross compatibility of the aftermarket semi helical gearsets, but worth a shot I thought..