I put a '54 grill in a '49 front end without using the '54 parking lights. It fit fine other than the fore mentioned corners. The '49 grill cavity was only exposed enough that I could have stuck one finger in the hole, but only in theory. I didn't actually stand there sticking my finger in the hole, so get that image out of your head
The truck was basically a "parts/possible project" truck, so I never finished it, but I think it would have been simple enough.
