harcar window balances 2 sizes

A handy person from ocala,florida says:

1 in picture 17in with out plastic ends, spring is 8.5 in

2 other size is 24in without plastic ends, spring is 12in long

can you guys help, manage a 40 apt complex and all the windows will not stay up

thank you in advance

jesse

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Paul from SWISCO responded:

Thanks for contacting us, Jesse. We believe your metal channel balances are 3/8" by 3/8". Could you confirm that? If it in fact is, our Series 800 channel balance could be the replacement for you. For your 17" balance, see our S800-17 with a 16B option (based on your stamping I see in the photo). As for the 24", we would need to know the stamping on that balance in order to determine which balance will work best. 

A handy person from FL says:
here is the stamp on the 24" one also these are rounded on one side last person order square and with no plactic
ends are the ends on each one
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Paul from SWISCO responded:

Thank you. Assuming the metal channel is 3/8" x 3/8" like I suspect, I recommend our S800-24 with a 23C option for this balance, and our S800-17 with a 16B option for the previous balance. However I highly recommend measuring your metal channel to confirm that it's 3/8" x 3/8".

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