Window balance

A quick learner from 92679 says:
Hi I need a total of 14 window balance sets I have 9 that are 34 in Long and have a number on it that says 3340 and has a sideways marking that says tsf. it is weird though because some of the same size ones have the same number but have a u at the back end of it says 3340U tsf. The next two are 28 in long and have a number that says 730 V. And the final 3 are length is 22in and has a marking that says 2130 r
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Tom from SWISCO responded:

With winged bottom attachments and wingless bottom attachments, these are Series 350 balances. 3340 will be our S350-34 , (2)730 will be S350-28 , and 2130 will be S350-22 . Ignore the U and R in the option numbers when you go to order. You'll see the 3340, 2730, and 2130 options on our website if you click the three links above.

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