Need replacement part for 1960s bypass closet door

A home owner from Moraga says:
October 6, 2017
I'm hoping you can help me find a suitable replacement for this part (two photos attached). I've been to several stores with no luck.

The patent number on the broken piece is 3058173. It was filed in the early 60's by Acme Manufacturing Company. The closest I can find is made by PLPCI (part #N-6548). Our handyman couldn't get it to fit in the channel though. (I attached a photo of the part installed on another sliding door.)
Bypass door roller
Profile picture of Paul
Paul from SWISCO responded:
October 12, 2017
Hello from SWISCO.com. Acme was bought out by Stanley and they discontinued this part in the last century. The closest we offer is our Acme style top roller 23-017. Let us know what you think.
Top Roller Pair, Acme
Top Roller Pair, Acme
23-017
$7.70
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