Tandem Wheels for Enclosed Lanai

A home owner from Honolulu HI says:
Name on the side of the wheels is

Del Mar Eng Co.
Long Beach Cal
PAT. 3,670,35

I have looked on line but can't find Del Mar Eng Co.

Anything you can do to help would be great.

I need 4 of these tandem wheels.

User submitted photos of a patio door roller.
Profile picture of Dave Sr.
Dave Sr. from SWISCO responded:
Thanks for posting! Take a look at our 81-052. The dimensions of the housing seem to be the same as the one in your photo. The biggest difference is the wheel, which is 1-1/2" in diameter on ours where yours is 1-3/4". I believe you should be able to adjust the rollers to make up for the difference, though. What do you think?
A home owner from Honolulu, HI says:
Looks like its worth a try. Thanks
A home owner from Honolulu, HI says:
i ordered the 81-052 part. the housing fit perfectly. exact match with 2 small exceptions. the housing on 81-052 had two little wings - one on each side that we had to cut off with a powerful dremel to fit into the base of the sliding doors. other exception was the pin that slides up and down sort of at an angle also had a head on it that added a small amount of width to the housing but it was negligible. otherwise 81-052 was a great fit and my lanai doors work great. so happy! no more straining my neck and shoulders trying to drag the doors open and closed. mahalo!!
Profile picture of Dave Sr.
Dave Sr. from SWISCO responded:
Great news! I'm glad everything worked out. Let us know if you need anything else.
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