Ultra Performance Components in Boronia, Victoria, Australia make full spool centres to suit standard diff housing. They are 28 spline and are $395 AUD + delivery.
More info at http://www.upc-online.com.au
Holden Gemini Full Spool Centre (28 spline)
Holden Gemini Mods & Resources
Isuzu G Series upgrades & modifications
Holden Gemini Mods & Resources
Isuzu G Series upgrades & modifications