That happened to me with the FASCO blower motor in our Coleman Mach 15. A/C quit, I found the fan stuck, lubed it with Turbine Oil, ran till the next time it'd been off for awhile. I was lubing it a few times a day till I found WD40 helped it more than the "right oil" but it would still stick, just take a little longer. Took the motor out, dismantled, cleaned bearings. Soaked, washed, crocus clothed shaft and bearings. Reassembled and it STILL STUCK! I can only figure that the sleeve bearing material gets corrupted with something that just won't go away. I don't give up easily but this time I bought a new motor.
I looked at Dometic fan motors, only on Amazon, and noticed some of the kits had tab brackets (but not your numbers) and one of the smooth motors came with bolt-on brackets. Are you sure you have the right cross reference to the new motor?