You'll need to cut out the parking light recess from the '54 fenders and weld them into the '49 fenders. Measure the location and cut holes in the '49 fenders to weld the recesses into. Round off the top left and right corners of the '49 fenders grille opening (weld in sheet metal as needed) to accommodate the rounded top edges of the '54 grille. Drill a bunch of 1/2" holes to mount the '54 grille to the front of the fenders. Do away with the '49 grille inner lower splash pan. The '54 grille has the inner lower splash pan as part of the grille. The hood latch pan will need some new holes drilled to mount to the upper grille bar. It's not exactly the same as the '49 but close enough. You'll see what I mean when you mock up the upper pan location. The hood latch and hood from the '49 or '54 will work. The front pan that goes between the bumper and grille will need to be from the '54, the '49 pan won't fit with the '54 grille.
