Have some sliding glass doors with rollers that appear to be built into the door frame - attached photo is the only part of the roller that appears to be removable. Roller still inside door frame inside molded part of the door and doesn't appear to be removable
mid- 1970's sliding glass aluminum door
Thanks for posting. Yes, this looks like just the inner portion of a roller assembly. The other part you mentioned is probably the outer housing, which is necessary for us to identify a match. Is the bottom of the door covered with the bottom rail?
You should have a screw on each corner that holds the frame together. You will also have a hole where you adjust the roller screw. Remove the corner screw that holds the frame together on both sides (you might want to lay the door down on a work bench or a good set of saw horses for this). Now with the assembly screws removed, take a block of wood and a mallet or soft headed hammer and tap off the bottom rail. It should come off without too much problem.
Take care not to damage the glass in the door. Take your time.
Once you have a complete roller assembly out, show us a picture of it and we can work from there. In the meantime, you can see our entire selection here.