Sold them today! :D
Finding an aftermarket wheel with a larger register isn't impossible, although if that kit requires a 3" register that's BIG. Not impossible but that's a horrible design. The stock 73+ disks have a smaller register (~2.7") and even that requires some machining on a bunch of aftermarket wheels.
I think that issue is that he wants steel rims, so, there's really no modifications you can make if the register isn't big enough. With aluminum rims you can have them machined to a larger register as long as the design of the rim allows for it. I had my enkei rpf1's machined to fit on the front of my Duster.