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They all share the same cab. I would fine a different source than LMC. They just buy and resell and not always the best quality. Their catalogs are fun to look at though. Check out Macs. They are one of the sponsors listed at the top of the page.
stuff such as brakes and even the front drums on the F350s can be found on Rock Auto (the drums are mostly interchangeable thru 1966) I would ditch the rear end which is likely geared at 5.14 and your engine will scream past 40-45 mph.
Cab, trim, engine, & transmission parts are shared with F100 & F250. Axles, brakes, wheels, frame are specific to F350. Quite a few sources around, but some parts still take some searching.