I have Del Mar rollers for my patio door.
The roller housing is 3-1/8" long, 1" high, and 3/4" wide. The wheels are 1-1/2".
Dave Sr. from SWISCO responded:
September 5, 2017
Hey there! It's not exact to your roller, but take a look at the 81-176. I believe this could work for your door. Take a look and see if it matches up to your roller.