Channel Balance which one and size

A handy person from Lexington, KY says:
April 14, 2018
I think I need Series 395 Channel Balances. It is 34" for just the metal piece, so not sure what size I need. See pictures.
Has marking of 3350 on the side.

Do I need balance shoe and top or do they come attached?
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A handy person from Lexington, KY says:
April 14, 2018
This broke I think partly because of the weight of the window. Would it be ok to go up from 3350 to 3360?
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Paul from SWISCO responded:
April 17, 2018

Thanks for using SWISCO for your hardware needs. As long as the bottom balance shoe depth is 1-1/8", you could go with our S395-34 channel balance. I know you mentioned that the stamping on your balance is "3350" which hold a sash of 28-32 pounds. This may have not been strong enough for your sash, hence why it broke. Let's have you weigh your window sash on a scale and get back to us with that number. From there, we can get back to you with some additional information.
A handy person from Lexington, KY says:
April 17, 2018
The sash weighs between 30-31 lbs.
The shoe is 1 1/8"
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Paul from SWISCO responded:
April 19, 2018

In that case, I'd recommend out S395-34 with a 3350 option based on your sash weight. Let us know if you have any more questions. 
34" Series 395 Channel Balance
34" Series 395 Channel Balance
S395-34
$11.73
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