Re: 33 Evinrude ski twin
Your friendly local Evinrude dealer. Or an on-line OEM parts dealer. Or go straight to the source:
Evinrude
Don't freak out when you get the new one. The originals were coated with shellac which Ethanol eats up. But the new one should be coated with an epoxy stuff that is ok. But looks similar.
EDIT: BTW, the part number is 375792. Sorry, iboats doesn't carry it.