channel balance

A quick learner from 20783 says:
one balance is marked 2120F, the other 2120 Q; one discernible differences 1) the color of the top shoe (immaterial). Not sure if I'm looking at S351 or S390 but I'm pretty sure its a 1" shoe depth cause there's seemingly nothing 1 1/8" about it. 22" length balances for sure. Thanks!
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Casey from SWISCO responded:
Hello,
If your bottom attachment has a 1" depth as shown below, you'll want to go with the S351-22 with a 2120 spring strength option. Thanks for posting!

72
A quick learner from 20783 says:
Thank you, Casey. one follow-up question. On the shoe that has a depth of 1 1/8" is the measurement from the bottom of the shoe to the tip of the prongs 1" or 1 1/8?
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Casey from SWISCO responded:

I am not sure if I understand your question 100%, but if you're measuring the depth of your bottom balance shoe, you want to measure it from front to back, just like in the diagram, we placed in our previous response. Does this help answer your question? 

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