I also installed the Fleabay disc kit on my 49 3600 - Performance Online I believe.

I forget the measurements, but I worked out what backspace I needed and went down to the local tire shop. We don't have much choice up here, but they were able to order me in rims that clear everything. They don't look stock but that was of little matter to me.

I had in my stash some white spoke 8 lugs that actually cleared everything but they were 16.5", would have saved me some $$ but. Whatever.
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1949 Chevrolet 3/4 Ton - Still Solid. Regular Driver
OT Vehicles:
1925 Hudson Brougham Super Six
1950 Chevrolet Styline (Parts)
1952 Canuck Pontiac Sedan Delivery (Well Underway)
1973 F250 4x4 Highboy
1977 F250 4x4 Lowboy