1980s Shimano 600 Derailleur Pulley Unit Compatibility

I'm hoping to save an old derailleur (Shimano RD-6207) that has loose pulley wheel bearings.

I found the part numbers needed (546-9812 and 546-9806).

I haven't had luck looking for an exact replacement, but they look comparable to modern Shimano pulley sets.

Edit: Just realized that my derailer pulleys each have 10 teeth, all modern ones I am seeing have 11.

Does anybody know where to purchase old pulley wheels? Or able to confirm these are compatible?

Thanks for any help.