Sliding door rollers

Hi there, no problem! Start by looking over our 81-263 roller assembly. Let us know if the dimensions differ from your original hardware at all.

It's a bit hard to read dimensions from pictures, but it does look like your roller's width is a bit smaller than the 81-263 (1/2" (approx) vs 5/8"). It looks like the height is possibly the same. The length for patio door rollers doesn't particularly matter. The other crucial dimension needed that your submitted photos don't show is the diameter of the wheel. 

This roller reminds me of the one we encountered in an older discussion here. Is this by chance for a screen door? That would account for why it's a bit off from the 81-263. Either way, this is the closest match we have, and I am not certain it will work for you with that smaller width. You might be better off contacting whoever made the door. Like with the older discussion, it's possible that this was something specially made.