Online site called "Parts Geek, LLC" - discontinued any purchases from CCOT due to price gouging. There are a number of sites, including SOR (Spectrum Off Road) that have the OEM equivalent hose.
As long as it seals, should be good to go. The surface of the slave is milled flat to accept the seal washer, so intended that the threaded portion be shorter than the port threading. Up to you to use. Just keep a 17mm wrench in the car :)