Tilt window shoe and pin

A quick learner from Waltham, MA says:
I have several vinyl insert replacement tilt-in windows with twisted sash pins and shoes. The only part ID I can make out looks like R1658 on the pins. Any help figuring out the right make (if there is a substitute i could make work, that would be fine also).

Thanks!

-Jay
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Paul from SWISCO responded:

Thanks for contacting us, Jay. The pivot shoe I see in your photo closely matches our 15-105. We haven't had any luck in locating your pivot bar for some time now, unfortunately. I suggest looking over the list of pivot bars I made for you on this page. They all fit in the 15-105 pivot shoe you have, though whether they will fit your sash is another matter. Some modification may be required, but I can't be sure exactly what will be involved. 

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