which top sash guide for this channel balance?

A quick learner from Columbus, OH says:
Hi, there,
I bought this channel balances already (Series 351-25, option 2430). They work fine. But I need to replace several corresponding top sash guides. My existing ones have a weird shape which I can't find any on your website matching the exact shape.
I originally thought mine was broken 18-159P. But when I have 18-159P in hand, it appeared to be slightly different. They have different positions for the lower screw hole. So I start to wonder if previous people installed the wrong top guides.
Please help!
Thumbnail of the uploaded file named Capture.JPG
Thumbnail of the uploaded file named IMG_20181111_215203.jpg
Thumbnail of the uploaded file named IMG_20181111_215058.jpg
Thumbnail of the uploaded file named IMG_20181111_215119.jpg
Profile picture of Paul
Paul from SWISCO responded:

We believe you have the old Gapco top sash guide that has been replaced with our 18-157. The dimensions seem to match. Take a look and let us know what you think.

Reply to Thread
Use this form to ask a follow-up question or to share your experience regarding this subject.
(your email address will be kept private and is only used to inform you when a response has been made)
Current wait time is 4-7 business days
We promise that one of our experts will personally get back to you as soon as they are able. Thank you very much for your patience and understanding. If your inquiry is time-sensitive, please feel free to reach us at 856-317-6263 or at help@swisco.com.