Replace window channel balances

A handy person from Tallahassee, FL says:
I need to replace the channel balances and sash guides for 6 windows. The balances are 29". The top attachment does not have "wings" but otherwise look similar. Would they work? 2830 is stamped on the balance. I don't have a whole sash guide. They appear to be 5/8" width. I believe the sash guides were the first things to deteriorate.
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Bob from SWISCO responded:

This looks like either an S351-29 or S390-29, depending on the depth of the bottom nylon shoe. Compare both with your old hardware to see what matches best. You will need a stamp option of 2830.

For the Top Sash Guide, is there an undamaged version on any window you can remove and show us from the front and side? That will help narrow things down. Many thanks. 

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