The COBRA Restorer pans that I received were for the 750 4779AAA Holley, not the 850, that's where the diff is, however, SA fabricated parts had three different ones that I have documented, so it's a shot in the dark to get it correct. Try COBRA Restorers again, they will solve the problem, and you can sell the 750 version to someone looking for that one.
sonny
