Sash Cam (paired w/ S385-27)

Thanks for reaching out to us. I'm not sure that I understand your last question. Our numbering convention doesn't have any direct bearing on any physical attribute of the part itself. These are more or less in sequential order to when they were added to our catalog.

That said, I believe you have a Milgard top sash guide that isn't made anymore. The best match is probably our 18-009 top sash guide but you will need to trim off the top plastic edges that stick out at the top. I know the top hole isn't elongated, but since it's nylon you can make it larger. I've done this before and found it to be an easy conversion that works perfectly for the Milgard non tilt window.

When installing the new top sash guide, make sure to use the same hole as the old one. Using the wrong hole might explain the issue you're having. 

Regarding the sash being stuck at the top, pull out the left and right take out clips, then raise the sash evenly. It should now pass the take out clips and lock the balances in the track so you can remove the sash, by moving the sash to the left and swinging the right side of the sash from the track.

I'm not really sure why that may be happening. If you pop out the take-out clips then they should catch the top attachment of the channel balance, preventing the balance from raising any further but allowing you to still remove the sash. They shouldn't just jam in place. Can you take a picture of your window where this is happening?