Greetings. I replaced a front driver side differential/axle seal about 6 months ago and it started leaking in 2. I got it from Napa, as shown in their book, Part #NOS 16123. I am obviously not happy as I have to replace it again. Napa doesn't show the inner dimension. Anybody replaced theirs with one that's dependable and have a part number to share? I see the rock auto and GM part numbers are kinda all over the place. My sub is 1999, K2500, 8700 gvw, J vin, 7.4L, pass everything but a gas station. thanx!
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