Thanks for confirming. Although, I'm not certain what guide you are referring to, unfortunately. I've recommended the balance needed as well as the replacement top sash guide according to what is in the photos. I'll need to see a photo of any additional parts.
You are more than welcome to order as many balances as you need to ensure that they will work. However, if you have confirmed the measurements, then I am confident these are the balances needed for your window.
In regard to the other stamps you'll need to confirm the same information from each balance to confirm that all of your windows need the Series 380 channel balances.
When you are ready to purchase the remainder of your balances, you'll be able to click the link above for to access the list of balances, once you've selected the length, you'll then select the option needed. For example, the 18" balance would need a 1730 stamp since it is marked with a 17 3.
The only stamps from the list that you cannot cross-reference are the ones marked ending in the number '9'. For those, you'll need to follow the instructions detail in my first response.
The order will need to be placed through the website from your online cart or by reaching out to our customer service team at (888) 991-1929, if you need assistance with placing the order.