Broken Window Track Pins

I have wood and vinyl wrapped windows. I do not know the original manufacturer as the builder is out of business. The L shaped pins that sit in the vertical sliding track are like pot metal and are starting to break off. I am looking for a suitable replacement part. The part is @3/8 inch wide, the vertical side of the part that is secured to the window frame with 2 wood screws is @ 1 3/8 inches tall. The right angle pin that sits in the window track extends out 5/8 inch.