Probably not need to be exactly the same, may be able to go slightly wider, depending on existing tire/fender clearance, if you are satisfied with existing tires. Must also check wheel/brake drum clearance.

A 14 bolt semi floating has 6 lug bolts, heavier duty than 10 bolt, may not be narrow enough, however, they come in at least two widths.

Ed

Last edited by EdPruss; 07/13/2017 12:34 PM.
'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.