I've been looking everywhere and I can't find nothing ! I Emailed Paxton about the Pressure box they use with there early mustang combo and they don't sell it buy it self !
Vortech unit, But I would use the Hat type that ATI-Procharger sells because you don't need to seal off everyhing and I found it easier to tune the Carb.
I purchased mine back in late 90's direct from Paxton but the link above has them all and I still like the bonnet better than the enclosure because it was a pain on my friends car and always had problems with leakage but the Demon Carb is the way to go because they even make a carb for bonnet style supercharging.