Replacement Cartridge for my Roller?

Thank you for your help with this. I see that Roller# 23-064 appears to be the replacement for my 4850145, but I also see that it's out of stock.

Is there a replacement for the cartridge that holds the wheel? I don't need the frame if I can just get the wheel.

The cartridge is 1.5" Wide, 0.5" Deep, and 1.625" to center of wheel (1 5/8) or 2.375" to bottom of wheel (2 3/8).