Channel Balance Identification

A home owner from USA says:
May 17, 2016
I am looking for the part numbers for these balances and attachments shown in attached pictures, stamped on the rails are 2420 on one and 1820 on the other.

Please let know so I can order.

Thanks
Bill
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
May 19, 2016
Please see our Series 390 channel balance in both cases. I think this is our best match to your hardware. If you also need the top sash guide, see our 18-009.
5/8" Top Sash Guide
5/8" Top Sash Guide
18-009
$0.99
25" Series 390 Channel Balance
25" Series 390 Channel Balance
S390-25
$10.55
19" Series 390 Channel Balance
19" Series 390 Channel Balance
S390-19
$9.34
Take Out Clip
Take Out Clip
16-002
$0.41
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