top sash guide
A quick learner from Boynton beach says:
September 28, 2015
Hi, I believe this is the correct one but looks different on front. Mine has no opening but this one doesn't (Product Code: 18-044) I just bought some incorrect ones and just want to make sure these ones will work.I have sliding Lawson windows SH-7500 if that helps but can also take more pics if required.
Paul from SWISCO responded:
September 30, 2015
Please see our 18-166. I think this may be a better match, judging by your pictures.