Replacement parts for HARVEY windows approximately 20 years old

A home owner from chicago says:
all inside mechanisms crack so windows will not open properly or slam shut
there is a metal part, a white plastic part and pulley of some sort

White plastic piece approximately 1 3/4 " x 3/4"
Round metal piece approximately 1" ?

One pick shows metal broken mechanism

Thank you for any help...none of my windows work :(
I think all inside pulley mechanisms need to be replaced

User submitted photos of a pivot shoe.
Profile picture of Paul
Paul from SWISCO responded:
The only thing I see broken is the round metal piece (called a cam) in the pivot shoe. Our 15-208 looks like a possible match. Is that all that's broken?
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