The 1st place I'd start looking is at the factory dealership in California. I've heard that they have a reputation for not being very responsive and don't stock repair part for their older carts.
Good luck.
American Custom Golf Cars Inc.
1525 E 6th St. Building 1
Corona, California, 92879
USA
Tel. (909) 597-2885
E-mail:
info@californiaroadster.com