All I can say is when SO did mine it was about $400 for a set (this was about 6-ish years ago IIRC). Belts came back after requesting thier "concors correct" restoation. No lables, no plastic sleeves.
When I questioned them the reply was pretty much "oh, well.... you can pay to send them back and pay us to fix it..." for another $200 plus interantional shipping both ways... to fix their error?? WTF? Lost me right there.
Had Python do a set a couple years ago. Lower cost, proper lables, and sleeves. Stitching was even better than SO. Maybe SO has lifted their game now that they have some competition, but Python gets my $.