Just going from memory, I believe that the 38" cast end decks are too narrow for much more than a 6-12 wheel and tire. One of my 70's and my 71 both have the 38" cast end deck and they each have 6-12 tires on them.
Just went and measured. On my 70 w/38" cast end deck, the wheel brackets (on the deck) measure 35-1/2" from outside to outside, from outside to outside on the 6-12 tires measures 33".
Anything with 8.5 tires (providing they are on the correct wheels) will measure right at 36" (give or take a little between manufactures). Given that these decks "swing" back and forth a little (quite a bit actually), I believe you are going to be hard pressed to get anything on there as wide as an 8.5...
Now... while I was looking, I have a 100 that has "wrong" wheels on it, (they have an odd offset and the valve stems are on the inside (Don't know, that's just how it was when I got it.)) they are 8.5s and measure 34 1/2" os to os. Something like that may work for you but I don't make any promises.
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