Would anyone know what part # this is?

This Better Bilt roller reminds me of the 87-181 Tandem Roller Assembly. To determine if this is the right replacement, carefully review the specifications below. 

You'll need to hold onto the screws for the installation. If you need replacements for them, we suggest taking an existing screw to the local hardware store, that way they can match them up for you.

Alternate image for 87-181