I got a new diff, but before it goes in my car I'm going to clean it up (Wire brush and some paint, no big deal), but I need a gasket for the cover. I was on the interwebs and came across the FEL-PRO Part # RDS55431 which rock auto says is for our diffs. Have you guys used or seen one of these, I'm skeptical cause the description says there are 10 bolt holes and the picture is circular. I just want to know if it will work or if I should plan on RTVing it.