Window balance replacement

A quick learner from Oviedo, FL says:
January 19, 2015
I have a Keller window, do now know which model number but it had spiral balances at one time. The old spiral balances are gone so I have nothing to compare.
How can I determine which balance to buy and what hardware, and what length?
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Paul from SWISCO responded:
January 22, 2015
Without having the original balances, it will be tricky to find the right hardware. That said, I think we can still help, but we will need to get creative.

First, please tell me the size of the visible glass and the weight of the sash. I will also need some pictures of the window itself, especially the fittings on the side of the sash and the lock.
A quick learner from Oviedo, FL 32765, USA says:
January 29, 2015
Thanks for the response, sorry it has taken me so long to reply, the sash weighs 12 lbs. Visible glass is 49" wide by 16 1/4" high. I have attached pictures of the window, side of the sash and locks.

The first pic is the side of the sash, the second is bottom, third is the lock, last is the entire sash.
User submitted photos of window hardware.
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Paul from SWISCO responded:
February 9, 2015
Thank you! Sorry for the wait. I believe you have Keller's Series 303 window. If I'm right, I would recommend our 18-002 top guide, 17-018 and 17-019 sash clips, and our S303-15 balance. However, I'm not one hundred percent sure this is correct. If you'd like, please give me the depth of the side rails so that I can confirm that the fittings will fit. I would also like to see the window frame track, which will help me determine if I have the right balance. Let me know!
A quick learner from Oviedo, FL 32765, USA says:
February 12, 2015
Hi Paul,
The interior width of the track on the sash is 3/4", the interior of the window track is 1 1/8". The depth of the side rails on the window sash is 1/2" and the same 1/2" on the window itself. I attached a pic of the track as well.
Thanks
User submitted a photo of window hardware.
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Paul from SWISCO responded:
February 13, 2015
Thank you. I'm afraid I'm still not sure, even with this picture. The hardware I suggested is our best guess, but I'm afraid without seeing what was originally installed there is no way to be certain. Did what I recommend look familiar? Do you have any neighbors that may have identical windows?
15" Keller Spiral Balance Assembly
15" Keller Spiral Balance Assembly
S303-15
$12.25
Top Sash Guide, Keller
Top Sash Guide, Keller
18-002
$1.97
RH Bottom Sash Clip, Keller
RH Bottom Sash Clip, Keller
17-018
$0.97
LH Bottom Sash Clip, Keller
LH Bottom Sash Clip, Keller
17-019
$0.97
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