The existing channel is stamped 32 -5 but it measures 33. Attempted to upload some pictures for you but they would not upload. My channel looks like your 795 series but not sure about what sash weight to select. The shoe at the bottom measures 1 1/4? wide. The top has the screw in loop type.
Casey from SWISCO responded:
April 9, 2018
Hello,
So sorry for the inconvenience. If you could send your channel balance pictures to customercare@swisco.com we will attach them to your discussion and go from there. Thank you!