Actually those are B belts so the 2010B85W is a 5/8" x 88". If you received a 2010B99W then you received a 5/8 x 102".
That sorta like me ordering a belt per the IPL for a Gravely and give a PN for a 60" deck instead of the 52" that the customer has in the shop. Arrrg; so frustrating with that happens as it cost more to return the incorrect belt then to just keep it for later use.