We changed out from R4's to Ags to work with the row spacing on our farm. I had great luck with new wheels from Hey Machinery . Used wheels are scarce as hens teeth. The ones we got were reasonable and shipped in just a couple of days.
Hey Wheel Home
I tried talking with someone but they didnt have the wheel specs in their records for a 1250? Would you mind sharing your information on what you gave them? I will order asap and I will tell them I heard from you and maybe they will give you a kickback.