THey make hardware kits for assembling grilles.... I think they are something like 160-170 pieces!
I have wrestled with trying to make a Chinese $600 chrome grille fit in my 51 panel.....
First off, the top bar is at least 1/2 inch TOO LONG! and the ends are pointed and
tried to dig themselves into the Chinese re-pop fenders.
You can make it all work, but you'll spend a bunch of time and use up a few of those tapered variable drill bits to make all the holes bigger so you
can actually make the )(*(&^% fit.
I had no choice since the original grill and fenders were destroyed. If your grille is workable ....... use it!
mike