I'm looking to replace hardware on 8 SH, aluminum frame windows. They were manufactured by PlyGem around 2013.
Channel balances are ribbed, 28" long. They look like your S750-28, except for the balance shoe connection. I thought maybe the S770-28 would be better, even though it's not ribbed.
If so, I'd need eight 28F and eight 28B. Which balancer bottom will work best with the 15-045 pivot shoe, which seems closest to the pivot shoe currently in place? It looks like Tilt Pivot 26-361 is the closest match. The Pivot shoe needed is 3/8" thick.