Window Channel balance replacement parts

A handy person from Austin, TX says:
March 7, 2017
Hi, Our windows are BFS (Builders FirstSupply). The top black piece popped this morning and fell to pieces. It is the left channel.
I removed the channel. The number is stamped on it is 2740. The channel measures 28" long. Can you help me identify the right replacement parts.
I look forward to your advice. Thanks,
George
User submitted photos of a window balance.
A handy person from Austin, TX says:
March 7, 2017
Here's a better picture of the top black plastic piece. The top measures a little over 1" x 7/8". As I said in the earlier post, this shattered so I may not have all the pieces. Hope this helps.
User submitted photos of a top sash guide.
Profile picture of Paul
Paul from SWISCO responded:
March 15, 2017
Thanks for posting. Your top sash guide resembles our 18-174, but just make sure the dimensions match. I'm not sure about the balance. The Series 395 may be a match, but it would come down to the nylon caps on either end. I'm afraid I can't quite make yours out.
5/8" Top Sash Guide, Alenco
5/8" Top Sash Guide, Alenco
18-174
$1.96
28" Series 395 Channel Balance
28" Series 395 Channel Balance
S395-28
$10.45
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