bi-fold door track guide
A handy person from Lewes, Delaware says:
October 3, 2016
This plastic piece fits into the track of a bi-fold door and the pin of the lead door fits into it. I do not have the exact measurements but it is approximately 3 " long by 3/4 wide
Paul from SWISCO responded:
October 6, 2016
I recommend looking at our 23-130, this seems to be a good match.