1/2 wide, 24" long. Double spring. 2323DSL and RB- BSI stamped on it.

Thanks for reaching out to us. Your balance appears to be a match for our Series 395. However, I'm not familiar with that stamp. Would it be possible to see a photo of it? That will allow me to determine if this is a strength option that we can supply.

Perfect, thanks! We can supply these balances, but they will have to be a custom order due to that stamp. It indicates  a heavy duty spring designed specifically for lower sashes.

I'll email you a purchase link and price quote now that will let you add 2 of these to your cart. You may then checkout as normal.

As for the nylon fittings, those would be our 19-005 top and 15-001 bottom. These are sold separately and may be added to your cart at any time before you checkout.