the prowedge boxes are very nice but unless you know someone that has one JL does not sell them seperate. If you can find one grab it if not have one built.
I have 2 JL 12w6v2's in a prowedge box and to this day is the best sounding setup ive heard. You could also go sealed built to jl specs and put in some polyfill. I whould call JL or email there tech team to find out exactly. It is hard to find the prowedge box by itself online. Ive heard the JL 12w6v2's sound great sealed and ported so you cant go wrong. If you listen to mostly rock and dont have a big enough amp then i whould go with ported but if you have a solid 800 watts rms - 1000 rms then i whould go sealed.