front oil galley plugs, size or part #

OK, run into a small snag here.

What size are the front oil galley plugs that go behind the cam thrust plate? I thought they were 19/32" but I am not positive. The ones I have that came in a MP freeze plug package are too small.

Went to the parts store and got Dorman 555-008 and 555-009. The # 008 is just a hair too small, not snug enough and will drop into the galley with one last tap. #009 is too big, can't get it to seat and don't want to crack the block trying to force it in.

Anyone know a part # or specific size for these things?

I do have a few in some older blocks but they are in good. I was going to try to pop them out from the back but the rear threaded plugs are rusted in and I don't have the proper 5/16" square driver...

Better yet, anyone on the North Shore of Long Island have two to spare?