Pivot bar replacement for Igmac double hung windows.

I have double hung Igmac windows installed in 1992. Some of the plastic "L" shaped pivot bars (see photos) have broken off where they go into the pivot shoe. The long arm of the bar is 2 1/2" with the screw holes 1 1/2" on center. The short arm of the bar is approx. 1 1/2". The bar is approx. 5/16" in width and height. I was hoping you would have original or after market replacement parts.