replacement channel balances

A handy person from New Jersey says:
September 26, 2011
I need to replace both channel balances on window since it will not stay up. The only number on them is 283000A J. This is no other identification such as manufacturer. They are both 29 inches in lenght 1/2 inches wide and 5/8 inches deep. This is not tilt window (top outside window fixed). Slider window which these are from is removed by pulling out both clips on inside top of frame then sliding window up over clips. Attaced are 1 photo of top and 2 of bottom edges (note corner of piece is broken).
User submitted photo of channel balance.
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Paul from SWISCO responded:
September 28, 2011
Your balance replacement appears to be the Swisco S370-29 with the stamp option 2830.
A quick learner says:
September 28, 2011
THANKS. I agree with your choice for top which is identical as show in photo, but the bottom piece appears to be slightly different since it does not extend up behind the frame as shown in first photo posted or do you think that it orginally did and broke off (it only appears that corner is missing to me). Maybe I should examine another window where the balance is still operational to see design?? Any thoughts or suggestions?
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Paul from SWISCO responded:
September 30, 2011
Well, if you're still uncertain, yes, I would examine the other balances. Maybe take a couple photos of them and upload them for us to take a look.
A quick learner says:
October 2, 2011
attached are additional photos of bottom piece from another undamaged unit. It appears to be similar to the part you are recommending. Size is identical outter edge appears to be square while your part is slightly rounded. Does this matter or is than an alternative part?
User submitted photo of bottom balance attachment.
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Paul from SWISCO responded:
October 5, 2011
Yes, this appears to be the Swisco S370-29 Channel Balance with stamp 2830.
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