Window balance

A quick learner from 92679 says:
May 31, 2018
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:
June 1, 2018

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.
34" Series 350 Channel Balance
34" Series 350 Channel Balance
S350-34
$11.73
28" Series 350 Channel Balance
28" Series 350 Channel Balance
S350-28
$10.97
22" Series 350 Channel Balance
22" Series 350 Channel Balance
S350-22
$9.91
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