Screen door steel roller replacement needed

I need a screen door roller replacement. It's steel and completely different from anything I've seen online and at the six hardware stores I visited in Los Angeles. I do not know the brand of the door, but I do see a sticker that's washed out, and I can see it has a date of 2011. Other than that, nothing is readable. The screen door has four of these installed. Two on the top and two on the bottom. It attaches with two small screws. The housing is 3.25" long by 1.25" deep and 1/4" wide. The wheel is concave.