I was cleaning out the shed and came across 3 old rims. Im pretty sure they are british but that is where it ends. I believe they are 13's They are 4 bolt with 3-3/4 bolt pattern. 2 of them measure 3-1/2 between the beads and the other 4-1/2. Some one wrote 307401 on the 2 narrow ones. There are 3 pictures each in my photobucket album. They are not in order but they are numbered 1A 1B 2A and so on . ie 1 being the 1st rim and A being 1st picture of that rim.
More & Larger pictures here. Photobucket pictures
More & Larger pictures here. Photobucket pictures