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S350-28 28" Series 350 Channel Balance

Hi, it looks like one of the channel balance top broke off and need help to ID the correct part to order. I've located your site from the little sticker on the window, but unsure, if this is correct. MFGR: RYL-017-1 Series: VS-5A MST:4-0x6-0 MVT: 48"x36" From researching your site, i thi ... (cont.)

I need three window balances for single hung dual pane metal frame windows manufactured around 1987. The metal channel is 28" long. The spring is 14" long. Pictures are attached. I don't know the manufacturer of the windows.

I have a Sunair window Balance w/2740 B.S.I stamped on it. I am a bit confused as to which series to get 350, 380 they all seem to have the same specs and end pieces. Thank you.

I need to replace two 28" channel balances labeled 2740E (the E is backwards) for a window that weighs 30 lbs. I would like the guides already attached. I've attached photos of the guides to this email and I can send additional photos if necessary. I don't know the manufacturer of the window. It is ... (cont.)

what does option 2740 mean for the S350-28 balance?