I had a 20 year old sliding door with no manufacturer markings, and bought the stainless steel
81-182 rollers.
PERFECT. Easy to install and this door is better than brand new. So, if you can lift a door out of its rolling path and clean the track before replacing the door, and handle a screwdriver, it is worth using swisco.com to find these rollers which are very hard to locate if not with this company. From now on, I'll look at swisco.com first whenever I need hardware parts.
Thanks again.