Yes, got mine at the jobber.15/16” seems to be the typical rear wheel cylinder used with 10” brakes. Is there a bolt-in 1” wheel cylinder that can replace the standard?
IIRC, several articles in the past stated that the 10 brakes were subject to locking from the factory and the solution was use a 15/16 cylYou increase the risk of rear wheel lock up by increasing the WC size.