[big gear head]

I was a Moser dealer for 15 years. I know exactly what you are talking about with those spring perches. There are better quality perches, but when you buy the rear end from Moser you don't get a choice. Tom's Differentials sells a much better perch if you ever need a set for something else. The hole in the backing plate needs to be bored to 3.155 inches so that the bearing can pass through it.