n2bnlow
+1y
1" tubing sounds good for a spacer, or you can take 1" out of the inside seat frame legs. But make sure you plate the floor on both sides where the new seat holes will be. I'd try to get at least a 3"x3"x1/8th" plate in there, if not bigger. Just so the bolts don't rip through the floor when there's a passenger sitting in them during an accident, normal driving, or if you're forced to make evasive maneuvers. Build it safe.
:XL: