non tilt window channel balance

A quick learner from Boston says:
Hi I need at least 8 of these do you have any thing in stock. It has 29 B stamped on it. The metal part measures 30 inches Thanks Kristen
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Bob from SWISCO responded:

Hello there. This appears to be either an S351-30 or S390-30. The only difference between these two balances is the depth of the bottom nylon shoe, or the 'heel-to-toe' measurement seen below, so compare both with your old hardware to see what matches best. For a stamp option choose 2920. 

S390vS351
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