are all 14FFs out of vans the same? these are what you need to run stock hummer rims, with like 1" spacers, or something like that, IIRC...is that right? anyway...I found a couple of them, but didn't have any way to measure them at the time...plus they're both still under the vans, with the wheels still bolted on, and kinda sittin in the mud...kinda hard to get under there and check anything. so I just wanted to know if they're all the same WMS-WMS. and if not...anyone know what the backing plate to backing plate measurement should be on the ones needed to run hummer rims? Also, is there any way to tell, without pulling the covers off..what gear ratio is in them? any numbers on the outside of the housing to look for or anything? I didn't see any options list or anything anywhere. thanks in advance.