STEP 1 Begin by applying a spray lubricant to back side threads of bolts holding left rear lock striker plate in place. Using the T40 star socket remove striker plate, discard shims. Hold GM1A-Rear Left bracket over two striker plate holes. Reinstall left side striker plate and bolts on top of GM1A-Rear Left bracket. Hold bracket firm against body of door and retighten star bit bolts. STEP 2 Using T27 star bit socket remove two latch bolts from right rear door leave 3rd screw in place to hold latch in place. Weather stripping on rear right door will need to be sliced through with a sharp utility knife. Hold right rear door bracket up against screw holes and mark weather stripping from top to bottom in location where bracket passes through. Cut rubber completely through along retaining strip. Then cut another 1/8 inch away from retaining strip and discard piece. Install right rear bracket through weather stripping. Reinstall two 6mm star head bolts using T27 socket. Only hand-tighten this side. CAUTION – Slowly close left then right door making sure weather stripping clears left bracket. Once doors are closed, align lock holes with RD Pin – (dowel pin, drill bit, etc. ) When you are satisfied with alignment, slowly open right side door and torque down both bolts. Shut rear door firmly. If lock fits nicely move on to side doors for installation of brackets using same process. If lock is difficult to slide on and off or difficult to close –Realign right side until desired fit is achieved – brackets can also be modified with round file or drilling center hole to accommodate various lock brands. Be careful to not damage your vehicles painted finish. PATE