They will mount, but not 100% if they'll use all of the mounting holes. I might be mistaken those with the radiator grille(s).
I've put on both types of grilles and although they don't share all of the mounting holes they fit secure enough. I don't think it had anything to do with the headlights though, unless we're talking about the headlights for the LX450 (Creates some gappage, IIRC).
You can search and find what you're looking for fairly easily, I think.