Wow! Those shift handles must be made of gold!
Since you are only looking for the support bracket I'd guess buying a new $600 set of controls will be your absolute last option.
It seems to me that with all the boats destroyed by h'cane Sandy that there must be some place where a lot of salvaged hardware ended up. I don't know if this outfit does that or not.
http://marinersmart.com/
Even paying a good metal fabricator to make you a new part would likely cost a lot less than the price of new.