Need help selecting right channel

Hello there. I wouldn't worry about the slight differences in the spring configuration; that varies by who made the balance. This is definitely either an S380-33 or S385-33, depending on the depth of the bottom nylon shoe. See the picture below for details. If the sash weighs exactly 38.5 pounds, you can use a new stamp option of 3265, which will support a sash that weighs 35 through 39 pounds. 

For the Top Sash Guide, see our 18-171. The top 'hat' is a little taller, but you can simply snip a bit of it off to make up the difference. 

Comparison of the S380 and S385 balance shoes.

There's really none I would recommend. There honestly aren't many instances where a different type of Top Sash Guide can replace the one you have. Now, Top Sash Guides do tend to break down from sunlight exposure and age. They otherwise should last a good while, but it's not so surprising that they'd all fail at once. If that's what has happened, then replacing them with the 18-171 is the best course of action.