Replacement parts for US Bi-fold doors

A handy person from Prosser, Wa. says:
I have three sets of doors by US plywood. The pins are 5/16 by 51/4 long. The top pivot pin looks like the Fenestra pin and spring. the bottom slide pin is threaded at the bottom of the pin with the nylon peice measureshole size is 3/16, the ring is 5/8, and the end is 3/8. I am not finding the replacment nylon for the bottom end. can you help? Thanks
A user submited photo of pivot pin
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Paul from SWISCO responded:
Good afternoon, and thanks for posting! Please take a look at our 21-001 and 21-065 bi-fold door pivots. These appear to be very similar to your own hardware.
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