'72 Demon hood on a '71?

I bought a nice hood that was supposed to be a '71. It appears it is not a '71 and may be a '72. The hood adjustment holes are different. The '71 plates that the bolts screw into slide back and forth in eliptical holes. The hood I have has round holes and the plate the screws fasten into is fixed. Has anyone dealt with this issue?
Thanks.