Channel Balance Help

A quick learner from California says:
The part has the marking on the side 2030L. Which part do I need .
Thanks.
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Bob from SWISCO responded:

Confirm that the metal channel, not including the nylon fittings on both ends, is 21" long. If so, see either our S351-21 or S390-21. The only difference between these two balances is the depth of the bottom nylon shoe, or the 'heel-to-toe' measurement, so compare both with your old hardware to see what matches best. You will need a stamp option of 2030. 

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