I like the 929- really luxurious, but you never see them like all the Lexi and Infinitis out there...
It's a rear wheel drive car, right? The rear suspension is a strut on an independent swingarm if I'm not mistaken, and knowing Mazda the front is a Macpherson strut... please look under there to verify!
I don't think anyone in the States is going to have a bolt-in kit for you, but you can always use AirLift's universal strut bags:
http://www.fbirides.com/product.asp?idno=260398
http://www.fbirides.com/product.asp?idno=260401
You'll have to weld your own mounts on them, but I think it may be the only way to go...
Good luck!!
-Phil at FBI