most all of the kits on flea bay are an interpretation of corvette/GM master booster set up à la RightStuff, CPP, Classic, et al.
some work, some don't, some need a right bit of fiddling about to get in, some are a nightmare. ALL need the supporting pieces from that particular kit to complete the install and make it clean looking-- you could cobble it together, but then you'll wind up with a cobbled together looking mess.
if you're gonna buy all brand new, doctor diff is the source. the right parts, the first time and top notch support.