I have an 89 1500 with an aftermarket windshield. I have tried adjusting the attaching screws every way possible and can not get the slots in the windshield to line-up with the mounting bolts so it will slide up and down. Any hints? Should I decide to replace the windshield, any recommendations as to what works best? A stock Honda windscreen for the 89 lists for $310 (Whew!!).