Old roller has 1.5 inch nylon wheel.
Metal part is 2 1/8 long and 1 1/2 high at highest part.
2 3/8 from end to center of wheel.
Has metal taps that slides into bottom frame
Used in old Alcoa sliding door - maybe 700/800 series but not sure
A home owner from Arlington, MA says:
July 29, 2016
it is Arcadia sliding doors, not Alcoa.
Looks as if roller 81-082 might be a good fit.
Old ones had nylon roller with a metal center.
Are the new ones similar to that with the nylon option?
Paul from SWISCO responded:
August 2, 2016
Thanks for posting. Yes, our 81-082 roller was actually used by Arcadia door company at a certain point. We offer this part with a nylon ball bearing wheel or a steel ball bearing wheel.