Looking for an Acorn, sliding glass door replacement roller

Hey, Lenora. Thanks for your patience during this busy summer.

We actually carry a bunch of rollers used in Acorn doors. Concerning the Series 800 specifically, you could start by looking at our 81-027. However I highly recommend removing the old roller to confirm that everything matches up. I've been burned too many times going by code alone when dealing with patio glass doors. In my experience, it's always better to check.