Don't force it. they will crack around the screw holes. Its a common problem. They are usually close enough to take a drill and add a little more clearance in them. Get them to fit the tank first, then move on to the hole that on the radiator bracket, these brackets get tweeked over time and may need to be tweeked back to line up right. DON"T over tighten the screws, they WILL crack the plastic.
YAMAHA 450 HYBRID
85 350X- RED
85 350x -BLACK
86 350x-WHITE (with Goki)
85 250r
83 atc 70
84 atc 70
84 atc 110
09 yfz 450
2006 Arctic Cat Prowler
RZR XP 900