I have what I believe is a 41 (please correct me if I'm wrong) wheel, and it is very different from this type. You can see it in the following link. Notice it has a recess in the bottom for the cast collar hub that fits there, as well as the three large holes for the collar prongs.

http://s300.photobucket.com/user/vf...8.25_zpsmz3mh2xl.jpg.html?sort=3&o=1

Last edited by BlueChipper; 06/07/2015 8:44 PM.

1956 GMC 100 NAPCO Deluxe
1955.1 Chevy 3600 NAPCO
1954 Chevy 3600 NAPCO