I have 3 sliding glass doors that need the rollers replaced. The doors are aluminum and I believe to be original to the home which was built in 1970. The only markings on the roller says
DEL MAR ENG.
LONG BEACH CAL.
PAT. PEND.
Paul from SWISCO responded:
May 23, 2018
Thanks for writing in. We'd like for you to start with taking a closer look at our 81-162 roller assembly. See if your measurements match up. If not, let us know how they are different.