Sliding glass door wheels
A handy person from Cooper City says:
September 14, 2014
Didn't see any identifiable numbers. 1980's South Florida home in Pembrooke Pines.
Paul from SWISCO responded:
September 16, 2014
I believe this is an old Air Control or Keller sliding door. We don't have an exact match for this part, but see our 81-006 and see if you can use this as a replacement.