Progress on window parts

A quick learner from usa says:
March 1, 2022
The channel balancers have a stamp on them reading 20C bsi
They are non tilt , single hung with aluminum sash
They are 21" from metal to metal
The shoe is 7/8", and we would need 3 pairs so 6 in total.
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Bob from SWISCO responded:
March 1, 2022

Thanks for posting. We can furbish these balances with a 7/8" deep shoe for you via custom order. I just sent you an email with a purchase link to order (6) of these 21" balances, stamped 2030, with the 19-005 Top and 15-029 Bottom attached. Let me know if you have further questions prior to placing this order. 
21" Series 380 Channel Balance
21" Series 380 Channel Balance
S380-21
$9.38
Winged Channel Balance Shoe, 7/8" Depth
Winged Channel Balance Shoe, 7/8" Depth
15-029
$0.82
Channel Balance Top, Winged
Channel Balance Top, Winged
19-005
$0.74
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