Yukon Gear YMSG1016 Corvette Differential Review

A customer advertised this part for a 1997 c5 Corvette, got it in the mail and now that I'm finally working on my Vette I'm looking up the old seal and compare it, but it's not even close, I also noticed that it says 63-79 on the box. Unfortunately, this is a past return window, so I'm out of luck.