screen door roller assembly, 1.5 inch steel BB roller. concave
I have 3 doors that need RnR so would need 6 assemblies.
Can you confirm that this is for a screen door? That must be some heavy duty door. The roller you have here is most commonly seen on glass doors. Either way, I think our 81-009 is a promising match. It's very similar to your dimensions and I think will work well as a replacement. You may want to look over our measurements just to be sure.
The question of using a nylon or steel wheel is something I personally go back and forth with. Steel wheels are obviously stronger but they can wear out the track sooner. They're also more susceptible to corrosion. Nylon wheels don't have either of those issues, but they will break sooner. It's pretty much a matter of whether you'd rather replace a track or a roller 15 years from now.
Based on your information it seems prudent for me to switch to plastic rollers. I have looked at the dimensions of the 81-009 assembly. It differs from mine in that the flare is near the bottom of the unit while on mine the flare is level with the mounting hole, which is further up. This would be a problem locking it into place without cutting a new opening in the rail. Also, it appears from the 81-009 photo that the mounting and adjustment locations are reversed (in mine the adjustment screw is at the top). The distance between them could also be problematic. Current strategy is to clean up old roller assemblies and search for plastic wheels to replace metal ones
Looking at your roller myself and considering your dimensions, I'm thinking that maybe the 81-032B might be a better match. Check it out and let me know what you think.