confirm balance option

A handy person from Central California says:

I just wanted to confirm prior to ordering:
I believe I have a series 390 balance after comparing and measuring my existing parts to the tops and shoes on your site.
The channel is 28" long but I am not sure exactly which option to choose as my balance isn't stamped with a 4 digit code. I included some pics of it.
The code on the back of the channel is: 27 4 GV CMC 7.
I was thinking that it may be S390-28 with an option code 2740? Is that correct?
I'd like to order 2 of them.

User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
I agree, the S390-28 looks to be the best match, assuming the measurements are the same. I also agree that the 2740 is the option to go with, but you can always weigh your sash to confirm. All orders can be placed directly on our site.
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