Sash cam replacement
Thanks for posting. This looks like our 18-009 Top Sash Guide. Please compare and let me know if this matches what you need.
Hello again. It looks like you are using the bottom hole in the old top sash guide--simply do the same with 18-036. No need to drill a top hole; as long as that bottom mount is being used okay, there shouldn't be any issue. As far as the top hat of 18-036, it is meant to give a clean finish to the sash, i.e., it's just so it looks nice. Therefore, being slightly less on the width (3/4") and slightly deeper (9/16") shouldn't affect the operation of the window sash in any way. Let us know if you have further questions!