Hey 3B, hope your staying warm.
The tank I was looking at on Rock Auto uses a sending until that has a lock ring......the tank I looked at Tank Inc. has one that the sending unit has the five holes with the two holes off set that you mention.
I'll check the one in my original 37 tank and see if the holes match.....the other "problem" may be that the mustang tank sits in the tank at about a 45 degree angle where mine is flat. However that does not mean I can't make it work though!!

More later.


1937 Chevy Pickup
In the Gallery
1952 Chevy Panel
In the Gallery
More photos
1950 Chevy Coupe
Pictures!

I'd rather walk and carry a Chevy hub cap than ride in a Ferd.
I can explain it to you, but I can't understand it for you smile