Guide from top of thirty-five year old bifold door

A home owner from Santa Fe, NM says:
Lost hard plastic part of guide. Can't find name of manufacturer. Guide is 1/2" by 3/4" viewed from the top.
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Tom from SWISCO responded:

Unfortunately, we don't have a guide like what you show here. The only thing we have that's similar is something like our 23-266 , but the plunger itself is very different from yours. You may want to consider a new replacement kit, which we show at the bottom of this page .

A home owner from Santa Fe, NM says:
Tom, looks like I need to start over with all new hardware. Opening is 59 1/2 inches wide. Doors are 1 1/4 inches thick and weigh around 38 pounds for each section. I will attach a photo of another set of these doors in our house. (Oops, sideways.). What should I get?
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Tom from SWISCO responded:

If your opening is ~59", then you should consider our 5' long 23-506 track kit for wood bifold doors. I cannot guarantee that this will work for you, but it's the only replacement kit we have for an opening in this size. 

A home owner from Santa Fe, NM says:
What are the differences between 23-506 and 23-552 and why did you recommend the first?
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Tom from SWISCO responded:

The major difference is the hardware used. I have more experience with the one I recommended, which is why it was my first thought, but either one is worth considering. It's up to you.

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