I have Milgard windows. My channel balance is marked 2090 26.
I believe I need series 385; however, I do not see an option for 2090.
From the measurements:
shoe - wing to wing is 15/16", base to tip nearly 1 1/8"
top - wing to wing is also 15/16", base to tip 1 3/8"
metal to metal - 21"
sash weight - 20lbs
