Car: '89 JDM ZC CRX

I'm rebuilding a ZC gearbox that was suffering from loud bearings and the 'clunk' associate with a worn diff pin. I've acquired a full rebuild kit but I can't work out where I can get a hardened diff pin (from the '92-'00 transmissions).

Can anyone help me out? Where would I buy a 92-00 d-series diff pin?