Spiral Balances: same length top and bottom, tip color

A landlord from PA says:
September 23, 2011
I am in need of spiral balances for double hung windows. In the past, all the windows I've replaced spiral balances on had the same length balance for top and bottom sashes. On these windows, I noticed the bottom balance is 33" long while the topis 31". I didn't know they could be different. Can you verify this is possible or did the previous owner replace with the incorrect lengths? All 3 windows are like this.

I also noticed the spiral balnce tip color is orange. which does not appear to be an option here.

Please advise

tx
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Paul from SWISCO responded:
September 23, 2011
Many companies use different sizes of balances for their top and bottom sashes. So, you should order the proper sizes of each sash.

The red and orange tip are the same; the orange is considered "red" in trade.
31" Series 600 Spiral Tilt Window Balance
31" Series 600 Spiral Tilt Window Balance
S600-31
$9.42
33" Series 600 Spiral Tilt Window Balance
33" Series 600 Spiral Tilt Window Balance
S600-33
$10.15
How to replace a tilt window spiral balance.
How to replace a tilt window spiral balance.
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How to Identify a Replacement Spiral Balance
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How to choose the proper spiral balance tip color
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