NOS Mopar LA CL-77 Main Bearing set Std
I checked my stock and I found an NOS old style thrust bearing PN 1879627 std. with the flange measuring 3.374" wide. It is spotted from age and the packing oil drying up, but I have used some of the big block ones that looked like this without issue. Anyway, I can offer this bearing in place of the wide flange thrust if interested.
