Aftermarket Dist Fit Issues

[GOSFAST]

Looking for feedback on certain brand distributors fitting in the 8BA timing covers.

Have a dist here won't go in any of 4 different cast iron timing covers?

Thanks, Gary in N.Y.

P.S. I know it's not a cover problem simply by the hsg size measured at the bottom section (photo below)! Have tried repeatedly to contact vendor, absolutely no response, phone or e-mails.