my 73 Dart Sport has the 2.80 center. So the big question here is : did Mopar even make a bbp axle 5 on 4.5 with a 2.5 pilot hole or did Moser set me up with a one of a kind setup. I have a hard time believeing they would do that and why does my drums have the 21227-C stamped in them. If Moser drilled the drums to fit the axles, they would not be stamped.