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You can simply get a rare earth magnet--small and very strong. Just stick or glue it to your existing cover and it will do just fine collecting all the small iron particles that accumulate in your diff. oil.
Not sure what you are asking, but that part number is an '08+ cover. They started using them on the diesel equipped trucks in '08, and they are backward compatible with your diff.
ok, ok, that clears it up. Thanks, sorry about the confusion.. VERY nice write up and the pics were great. Its too bad they dont make a matching one for the front. Do the 08+ trucks have the same covers as our trucks?