Holley Adjust-A-Jet kit

I just bought an Adjust-A-Jet kit for my Dart's Holley 4160 carb, along with the replacement crossover tube. The trouble is, I can't figure out if I am supposed to use one or two of the kits with the crossover tube. Before I start taking things apart, does anyone know if I need to order a second Adjust-A-Jet plate?

Well, as soon as I got the thing apart, the answer became evident: It's not possible to install that thing on the secondary side of a 4160 anyway. I'd have to put a 4150 rear metering plate on it first.

Well I could have told ya that ! Sheesh ! Man everybody knows that...lol