If you have the luck to find a McClaren Grille, go buy a plane ticket and fly to Vegas with it. They are rare.
Most people who are replacing the grille update it with an LSE grille or look to paint it. Quite a few people have swapped front bumpers on a Gen I to a Gen II LSE or an '06 LS front bumper. Completely changes the look. The grille is swappable without a problem. The bumper from a gen II LSE, or '06 LS will leave a gap between your headlights and bumper without proper brackets I do believe. Correct me if I'm wrong.
Is grille and rear surround paint matched? Nice. Anyways welcome to LVC. Perhaps for the sake of this thread post your questions in a thread and utilize the search function.
Finally, welcome to LVC. Lot's of very wise individuals on here.