Wade, welcome to the forum.
The rim size for the 18" is 7,5J in the front and 8J at the rear.
I've got the oem 18" rims on mine.
The 7,5J takes tyre size 205, 215 or 225. The rear is 225, 235 or 245.
My current set is 225 all round, to allow rotation when doing balancing and alignment.
The previous set was 225 in front and 245 at rear
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