Channel balances required

A quick learner from Florida says:
2940 stamped on the channel, 30in length, 1/2 in width, require 4 total (2 pairs)
Thank you!
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Bob from SWISCO responded:

Thanks for posting. This looks like it might be our S380-30 Channel Balance. I'd like you to double-check the 'depth' of the bottom nylon shoe just to be safe. The depth is the distance between the heel and toe of the shoe. For the Series 380, this dimension is 1". However, I want to make sure your balance's shoe doesn't match the specifications of our 15-029, which has a depth of 7/8". If it's closer to that latter measurement, then we may need to custom build these balances for you. Just let us know. 

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