Sliding door rollers

I could not find any numbers on rollers or on the door itself. The door is in a Manufactured home built in 1993. The measurements I took are as follows: 15/16 thick, 2 9/16 long and 1 3/8 tall.

After studying photos, I decided that the 81-279 was the roller assembly I needed. I hope that is the case. I also ordered a new rail cap and some screws.
I needed these quickly as the temps are going down and I have a small window of time to replace rollers.
Great website!