I just did a grill conversion on mine from a 1973 grill to a 1975, prior to which I had to rebuild the grill, that I got from the junkyard. Just had to fab up some brackets inside where the 73 use to mount. Then mount these for the 1975 grill. Pretty simple really.
All the details are here
http://67-72chevytrucks.com/vboard/s...d.php?t=791250
1973 grill is pictured first then the 1975.