Channel balance marked 27-4

I need to replace a pair of channel balances, and your Series 395 product is exactly what I need (19-005 winged balance top and 15-001 balance shoe; the shapes and measurements are a perfect match to the originals). But I'm a bit confused about the length of the balance. The metal part measures 28" exactly. But it's stamped "27-4". So do I order a pair of 28" S395-28 balances with the "2740" option? I'm guessing that "2740" corresponds to the "27-4" on the original. See picture from your web site attached.

Am I correct in my thinking?

Thank you,

Mark

Sorry - I hadn't scrolled down the product information page far enough, and just now noticed that this question was asked and answered back in 2017.

I'll go ahead and order the balances now. (GREAT web site for DIYers, by the way!)

Thanks,

mb

Job Complete!

I just wanted to let you know that I installed the replacement channel balances, and the window now works perfectly again. It was quite easy (took about 5 minutes), just like in your YouTube video, and I am very pleased. Couldn't have done this without your Part Identifier web pages...

Thank you for your assistance!

mb