6868 Renaissance patio door

Thanks for posting. I'm afraid we don't have an exact replacement for this roller. Since it's probably over two decades old it's likely no longer available. The good news however is that we have a possible alternative. We think the 81-279 might work as a substitute, though it will take a little extra work. 

Now, I believe your old roller slides out of the end of the bottom rail, and no screws or clips hold it in place. Is that correct? Since none of our typical rollers work this way, you'll have to find a way to adapt the 81-279 to your door. This could be done possibly in two different ways. The first possibility is to remove the bottom rail completely from the door so that you could drill and counter sink the head of a flat head screw like the 33-013 so that it would not interfere with the glass. This would then let you install the roller. The second option, which worked for a customer with your exact same roller, is to cut a small piece of metal out of an angle bracket and screw it to the front of the roller. This could give the roller a small 'lip' to hold it in place just like your original. Let us know if you think either option could potentially work for you. 

Sure, you can see detailed photos and a price breakdown on the 81-279 store page (linked above). I'll also post that same diagram below for you to review.

Alternate image for 81-279

Thanks! We appreciate the business, it means a lot. Please feel free to reach out if you had any questions and I'd be happy to advise.