A quick learner from Holme Beach, FL says:
November 12, 2014
I have Simonton double hung windows. I'm not sure of the model number but I have sent a picture of the bar code from the sash in case it helps. The plastic piece that holds the cam is broken at the bottom. It measures 1 1/2" X 11/4" X 7/8. I'm not sure if I need the 15-192 or the 15-155. Any clarification would be appreciated.
Paul from SWISCO responded:
November 17, 2014
Personally, I would go with the 15-155 pivot lock shoe. Just double check your pivot bar. If it's straight, it should fit in the new metal cam. If not, you can always reuse your old metal cam.