I need 4 rollers for a sliding glass door on a boat

A quick learner from Seattle, WA 98107 says:
Identifying marks on roller:

del mar eng
Long Beach, CA
Pat. # 3.670.357


2-1/2" long x 2" tall x 3/4" wide

roller is stamped "Kilian" Syracuse Toronto

attachment piece is verticle w a 3/16" hole
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Paul from SWISCO responded:
When I search for your patent number, I get our 81-033. Does this look familiar? If not, please remove the roller from the door and take a few pictures of it for me to see. Thanks!
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