39 allis-B riveted front wheel center

I"m new to the tractor world but bought a 39 allis-B last year. The previous Owner welded car rims to the wheel centers. I need to change the rim. It looks like the center has 6 rivets. The rims I look at have 5 bolt holes. Was the tracot manufactured with 6 rivets? Will a 5 bolt rim fit the wheel center? Can anyone provide better information than I have. See pics.
Thanks in advance.
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What your calling a rivet is in fact what a wheel stud will look like from the back side. As in you drive out the old stud and install new lug bolts or studs which ever you want to call them
 
Early on, the B was built with wheel and hub units which were riveted together. The AC parts book calls for replacement with newer type hub and wheel using 5 lug bolts. What I see in your picture is the rim rotted out so it was cut off and an auto wheel welded onto it. If you want to go back to original, cut off the auto wheel and weld a new 3x15 rim onto the wheel disc.
 
You are correct in the fact they are rivets. Made it a little tough to change having to remove it at the spindle. They were used on tractors 6019 thru 26524. At this point your easiest fix would be to find the 5 lug bolt hubs and wheels. The bearings and seals are the same for either one. Lee
 
Your tractor came with front wheels which had a center section hot riveted to the rim. Some one cut off the rivets,removed the factory rim and welded auto wheels to the centers. Looks like VW wheels were used.No big deal to revert to as came if you can find the rim pieces some where. .
 
Jerry is right. the first year or two of production, the rims were rivit to the hub. about 1940 they changed the hubs to drilled and threaded holes for lug bolts and the rims were drilled like auto rims... you can modify your hubs, or get different 5 bolt hubs, and newer 5 bolt rims from a 1940-58 tractor.
 

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