I replaced mine some years ago with a high torque starter from 'The Engine Centre'. At the time they were in Pound Rd, Narre Warren South and he had trouble sourcing the right adaptor plate for use with the 'Essex' V6. He did however use a contact in New Zealand who had the right adaptor plate and once that problem was sorted, happy days! He has since moved to Garfield in West Gippsland, Victoria and can be found at this web address:
http://www.enginecentre.com.au/