Replacement block and chain balance for windows

Cannot find the manufacturer on any of the window in the house. They were here when we purchased it. But i need to fix the extended channel balances on a few but before I got too deep was wanting to know the cost of these replacement. For now, I just need 2 to fix a window we frequently use. I then plan on making a project out of fixing all the broken springs, torn nylon strings...as there are plenty but all different sizes and I just dont have a list ready to go. But it all depends on how much you charge for a couple of these shipped to 78028, if you even have them.

They are 28" without attachments, upper is winged for 1" width lower is not. The only makring on these is "1 274000HN" which I am assuming is possibly a 27-4?

Thanks,

I just ordered four (4) might as well replace both windows with new hardware. I will have to attach the alarm magnetic sensors as they have come undone on both windows. That side face the sun, and melted the silicone they used many years ago. They were just siliconed to the balance shoe.

I tried a cheap replacement from Amazon, and they sucked! Especially without the proper upper and lowes it just wiggled. It opened and closed, but wont last long. Those are going back...lol


Thanks again for your help. When I have time, I need to check ALL the windows and will likely be back with different sizes and if these work out, I will be one happy guy. Have a great weekend and I will say SWISCO popped up first on EVERY search engine no matter how I worded them. Replacement window sliders, channel balance, blocka nd chain channel balance....every time y'all were on the first page.