i found a guy on craigslist who bought a set of 38x15.5x16.5 radial swampers and hey cannot turn them w/out hitting his fenders but he doesnt want to trim, instead he wants to swap me for my tires, 37x12.5x16 SSR's. one of the main reasons he wants to swap w/ me is we have the exact same style of wheels. heres my qualm with the situation... he only has 4, i have 5 and i need to ensure that my spare will work w/ the rest. will a 37in spare work with 38's? i am conserned becuase i am planning a trip to baja this summer and the reality is i may be utilizing spares for some distance he also has staun internal beadlocks for the wheels that he wants $150 each (600) for. is this a good deal/idea? what do u guys think?