Valkyrie adjustable bases are compatible with all current and past models. They're adjustable between 40 and 15-degrees and maintain a near stock ride height.
 
Price is for one adjustable base. Each order comes with a 7/16" wrench, along with a precision cupped washer. You'll need to use the small end of a skatetool on the head of the bolt, along with the 7/16" wrench on the nut, to loosen/tighten.