New Guy, Not sure what your existing pattern is, 4.75 x 7.25 doesn't make sense, usually the first number is the number of lugs, the second is the diameter, i.e. 10 on 7.25" for example. I made some steel adapters to put original IHC 5 on 8 wheels on a D 70. 1" or so steel, drill and tap 8 on 6.5" for Allen bolts from inside of axle, bore ID of adapter to fit Dana hub, drill and tap 5 on 8" for stud centered IHC wheel. Been working fine for 10 years or so. Ed

'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.