Another member on here had one for sale for quite sometime but has since sold it. I think even if someone did have one for sale, unless it was local to you, shipping costs would likely be quite horrendous. I'm thinking your best bet would be to look for a local shop that could fabricate one up for you, or you might try calling RNR Marine, who I believe are the ones that made them originally. They might have some advice for you.
rnr-marine.com