Channel balance and sash top pieces

A quick learner says:
There is no stamps on the channel balance. They appear to 1/2 inch wide and 30 inch in length. Four windows (8 balances) that measures approximately 50x32.
Markings printed on the channel balances differ from window to window.
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Bob from SWISCO responded:

Take a look at our S380-30 or S385-30. The only difference between these two balances is the 'depth' of the bottom nylon shoe, so compare both with your old hardware to see what matches best. You will need a stamp option of 2960. 

A quick learner says:
Thank you. Any help identifying the top sash guide?
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Bob from SWISCO responded:

Apologies, I almost forgot! See our 18-009 or 18-166 to start. Go over the dimensions of both top sash guides and see if one of these match what you need.

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