Used a pair of these to replace the lousy OEM door speakers, these worked perfectly, to get to fit the door and speakers perfectly, if using 6.5" speakers take a pair of ordinary pliers and remove the tabs inside the speaker cutout on these adapters (they just snap off easily) and also remove the outer rim where the door panel fits around the corner it too just snaps off easily with pliers, you will clearly see what I mean when you are installing them.
Also use a few pieces of foam tape at the bottom to seal these adapters to the door frame to prevent rattles.