there are a few compressor manufacturers, like vortex, eaton, ASA, etc
tuners will choose the compressors and build kits around them. the newest kid on the block is made by a young engineer, who formed ASA to manufacture his new creation. this kit proved so efficient (up to 15 times your engine rpm, using a turbo's turbine as a blower) that many tuners began switching to using ASA's SC instead.
current tuners like rennsport, infinitas, ess, alpina, ac schnitzer etc use ASA.
other tuners who use superchargers like novitec, TRD, may choose other blowers but they will manufacture their own kit to fit.
car manufacturers will also use them in their production cars, like merc benz which uses i believe vortex SCs, as well as other cars like Mini, ford gt, etc.
what you want is a complete kit, and not just a blower only. Contacting ASA and buying a supercharger off them is completely useless to you, unless you want to fabricate everything to fit the SC into your car. so you're better off looking for rennsport from USA, infinitas from Germany, ESS tuning from Norway etc.