My guess is that the Merc equivalents will fit. I would recommend try to parts guys.
My first recommendation is Doug Penn (douglas.penn@gmail.com). I have done lots of business with Doug. Great guy to deal with and if he doesn't have it, he might be able to track it down for you.
You may also want to try Bob Grubb (bob@grubb.com), who has lots of Merc parts available.
There are others out there I am sure, but I would start with the two above!