channel balance variety pack

A professional from Oregon says:
I need some channel balances for my no-tilt windows.

What if the length of the item, from end of metal to end of metal does not measure out to a whole number, do I round up or down?

I have attached photos of all of the balances I need to replace.

The picture with 3 balances are all 31" in length, but in another picture, the end of one of them is different.

The balance with one end that is grey and the other white is about 21 3/8" in length.

The last balance is about 21 3/4" in length.
User submitted photos of a window balance.
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Tom from SWISCO responded:
Looks like you have a few different balances. Some are standard, but some have to be custom made. You'll note that some of your balances have a pulley wheel inside the bottom shoe, notable in your second photo. These balances will need to be custom made, no standard balance can replace them.

For the balances that don't have wheels inside the shoe, I recommend that you look at our Channel Balance Home Page and follow the steps in order to find the Series that best matches what you have. You appear to have a couple different Series.

For the balances that do need to be custom made, I need a clear picture of the metal clip at the end of the cord and both nylon attachments at either end. I will also need to know their lengths, their corresponding stamps, and how many of each you need.
A quick learner from 21-75- 46 st. Astoria NY 11105 says:
2 Chanel balanced broke I like to buy two new ones number is 21B the length is 21 7/8 the width is 916. Thank you I hope you can help me.
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Tom from SWISCO responded:

Unfortunately, the provided information is not enough to identify a replacement. We may be able to help you, but we will require clear and unobscured photos of the balance components. The video below will explain exactly what we need. 

How to Replace a Non-Tilt Channel Balance
How to Replace a Non-Tilt Channel Balance
VIDEO
WATCH >
How to Repair a Jammed Window
How to Repair a Jammed Window
VIDEO
WATCH >
How to Identify Replacement Channel Balances
How to Identify Replacement Channel Balances
VIDEO
WATCH >
How to replace a non-tilt channel balance
How to replace a non-tilt channel balance
GUIDE
READ >
Choosing a Non-tilt Channel Balance: What Will We Need?
Choosing a Non-tilt Channel Balance: What Will We Need?
GUIDE
READ >
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