I used the grill you get from NPD, though I got it from OMS. Its the same part.
Fit was perfect! Don Made sure I had all the parts I needed to make it work, including the tiny parts I DIdnt see in the box till I tried to put it on and realized something was missing. I believe it was some kind of nut thread insert somewhere. It was in the box with all the paper. I missed it.
If your converting from the Non-Mach 1 Grill, you will need this style late 71-72/73 center support. Not reproduced. Original was expensive but not terrible.
I also got the reproduction lights. They are Grey. I got the Connectors from Napa thanks to another member telling me the part number, which escapes me at the moment. He also told me which bulb to get.
Connector from Napa, only 2 of the 3 leads get connected. I wired them in with the side marker lights.
you can see the grey housing for the lights here.
To Install, Start by removing the lower Valence. Then I had to Unbolt the bumper brackets on the frame rails. Remove the front bolts, loosen the rear bolts but dont remove. The bumper will then hang down out of the way. Then you can unbolt the the center supports for the old grill. Then remove the headlight trim rings. There are 3 screws around the headlight bucket that hold the grill on each side.
Then there were some minor details I dont quite remember. It took MUCH test fitting, removing, test fitting to figure out how to get it in place. I think I had a harder time because I think the front corner of one side got hit at some point and my front clip is tweaked a bit, which caused much grief installing the grill. I literally had to bolt one side, and compress and bend it out at the center to get the other side to line up one screw at a time till I got it on. It was a major pain, but only because I think the front frame is tweaked a bit.