randlemanboater
If you already have a 20 motor why don't you just extend it 5 more inches with an extension? 
www.Baymfg.com makes them for many models.  I recently got a NOS one off Ebay recently for $31.00 they come up every now and then just keep looking
You can check my gallery, I'm running one on the 235 Evinrude I have hanging now and I haven't had a problems with it.