I agree,AIM will send you a kit but i doubt you'll get much back-up.My PT Cruiser was one of the first around 4 years ago,i imported a kit for the PT from the US from Air Ride Technologies-a real reputable company,but the kit was not all compatable,some of it still sits in my workshop,some new bits made,some used from diferrent brands!.you can buy custom made strut bags like BIGPERM describes,i have them on my PT (about the only thing the company did get right!),they're like a regular strut but obviously with a bag in place of the spring and the whole thing is tailored to suit the car's camber etc.i had sleeve bags on the rear and didn't use the regular donut style,i also had them welded in place as they came dislodged under lots of lift
The PT had done 30,000 miles on the bags now,Ray of Rayvern Hydraulics fitted it and i'm glad i went that way,i also never leave the car with inflated bags,i always deplete them and "touch wood" i've never had any trouble,i drive it pretty normal too,i don't pussyfoot around! the handling isn't quite as good-it had a spring/strut kit on before,always on 19's.My advice would be to give Ray a call and go through a few things,use decent stuff like Funbags suggests,try Suicide Doors.com or Godfather Customs,pick up a copy of Sport Truck or Minitruckin' and take a look at wots wot?
hey best of luck!