FWIW, the book says that the center hole on a '41 with 10 lug x 7.25 bolt pattern is 4.75".
HevyHauler - The point I was trying to make with the last link was that the angle of the lip on a tubeless is much more acute, and more shallow, than on a tube type. Sometimes guys that have widow makers look at the front side of their wheels and wrongly think that since there's no lock ring it must be a tubeless rim. My point was that you can tell by looking at the lip whether it's tube type or tubeless. Here's maybe a better link to show the comparison of the tube type 5° lip compared to the 15° tubeless lip. Hope this does a better job of explaining it. If not, let me know. Stu
http://i286.photobucket.com/albums/ll89/truckdog62563/wheels/5degvs15deg.jpg
