Patio Door Slider Roller
AMAA Certification
MFR: PHP-28
A-L-I Validator
Series 870
Type: Patio Door
870 03200328
I'm afraid the given information doesn't tell me anything about the rollers used. The only way to learn that is to see it off the door.
I know that's likely more work than you wanted to put into this project before you had a replacement on hand, but it's just how these doors are designed. The only way to identify a replacement roller is to use the original as reference, which necessitates seeing it removed and free of obstruction. I apologize for the inconvenience.
If you want to pursue this, then please make sure I can see the back end, top, and sides of the original assembly. Written dimensions would also be a huge help if you can get them. Once I have that information I will see if anything in our inventory is a match.