Hi,
Here is photos of parts, the channel balances are 28"x1/2" with non wing top guide and 1 1/8 " shoe with 2730 J stamped on it. The 390 looks very close. The Top Sash guide is a liittle more confusing but attached photos and hope helps. I neeed 20 channel balances and 36 Top Sash guides. If questions or any more information please ley me know.
I will order as soon as you get back to me.
Sincerely,
Steven =