No Markings on door or part

Hello,

Take a look at the 81-023 patio roller. I have used this part in the past to replace unavailable patio door rollers but it is a little tricky to install. Review the specifications shown on our product page to see if the roller housing will fit into your bottom door rail. Thank you. 

If the 81-023 does wind up being too wide, you could consider using something like the 1-1/4" diameter 81-224 wheel with the 81-304 replacement axle as long as your original housing is still in good condition and the wheel size matchs yours.