Del Mar Eng Long Beach Cal Pat Pend

Thanks for posting! Your roller appears to be closest in design to the 81-144 Sliding Door Roller Assembly, which has a 1-1/2" nylon wheel. To determine if this is the correct match, carefully compare the specifications below.

A few other options are the 81-269 and 81-256 but I am less confident in the latter as a replacement give the shape of the housing.

Alternate image for 81-144