please help with replacement part ID

Hello,
I'm trying to identify the correct part to replace the wheels on a sliding-glass door. The originals are stamped:
"1
DEL MAR ENG.
LONG BEACH, CAL.
PAT. 3,670,357"

I have attached several scaled photos of the part installed & removed.

Thanks,
Evan

That's the one, thanks! And it helpfully pulled up the "Peachtree Roller Guide" as a related item, which I also needed and didn't know the name of.