YES they are adjustable! check this
http://www.huracantalk.com/forums/ge...-shipment.html
You can see the adjustable collars.
Springs list for ~1800, Baan is the least expensive closer to 1k. From your local shop should range 1400-1500ish. If your local shop is also the installer, id advise to buy from them vs. saving a couple hundred. it is a fairly complex install, you want them set up right and you want the full support of the installer...and if you're using AutoArt, id use them as your one stop shop on these ; )