Can't tell the diff. between S380 and S385

A handy person from Camarillo says:

I need some help identifying the channel balance model I need. I can't tell the diff between the S380 and S385 models; in particular the 15-005 and -004 shoe. The metal frame is stamped with "26 5 GW CMC 7".

Can you help?

User submitted a photo of window balances.
A handy person from Camarillo says:
P.S. The balance is 27in long.
Profile picture of Paul
Paul from SWISCO responded:
Your balance looks like our S385-27 channel balance. Just make sure the nylon fittings are the same. As for the stamp, I'd recommend the 2650 option.
A handy person from Camarillo says:
Thank you! Am taking your recommendation!
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