What bracket to choose for window channel?

Hi, I am not sure which window channel to order. My broken on is a 27" length x1/2" wide channel with the numbers 2630 bsi printed on the back. From your website, it looks like there are a couple of channels that have similar top and bottom brackets. I will attach a couple of photos of the brackets, and I hope you can tell me which to order. If it is the wrong one, are they returnable/exchangeable?

I would appreciate your help figuring out which replacement to purchase.
Please email me the number of the correct replacement channel.
Thank you so much for your assistance!

Thanks for much for the quick reply! I'm not sure which direction is the depth. I took a few photos against a ruler--can you tell from the photos, or at least confirm which angle is the depth? Then I can measure more accurately, and choose the right one. Thanks for your time.

the depth of the shoe is 1", so I guess it is 15-005. I should have enough to order now--thanks!