1/2" channel balances for non tilt windows stamped 2740

A contractor from Vincentown, NJ says:
I have my choice narrowed to the series 380 or series 385.What is the difference between the 15-005 and the 15-004 bottom shoe. My channel balance is 28" in length and the top and bottom plastic pieces are the same color (white) if this means anything. The pictures are from my cell phone. I hope you can see them. the number stamped on the channel is 2740.
Thanks for your help,
A user submitted image of channel balance
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Mike from SWISCO responded:
Thanks for posting, Chris!

Take a look at the following channel balance attachment guide so you can see the difference between the 15-004 and 15-005:
Swisco Channel Balance guide.
Let us know which one matches your measurements.
A contractor from Vincentown,NJ says:
Mike,Thanks for the detailed descriptions of the bottom guides. My guides match the 15-004. I will be placing an order in the next couple of days.
Thanks, Chris
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Mike from SWISCO responded:
Of course, Chris! I was more than happy to help. Please let me know if you have any further questions.
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