I didn't notice this until recently, but turns out... at some point in time Happiest Baby actually changed the motor.

I don't know how to differentiate which motor people have until the snoo is opened.

This other motor has a bigger shaft that requires larger bearings and O-rings.

90% of the repairs I have done use the aforementioned bearings and these O-rings:

202 Buna-N O-Ring, 70A Durometer,... https://www.amazon.com/dp/B000FN0VYC?ref=ppx_pop_mob_ap_share

The others use these:

uxcell Nitrile Rubber O-Rings... https://www.amazon.com/dp/B07GQWB5H2?ref=ppx_pop_mob_ap_share

uxcell 695ZZ Deep Groove Ball... https://www.amazon.com/dp/B07FVYR9S5?ref=ppx_pop_mob_ap_share

Camoo 625ZZ Double Metal Seal... https://www.amazon.com/dp/B09FLDZYZS?ref=ppx_pop_mob_ap_share