This applies to center caps off of 02-04 KJ's only!!! These are held on by three screws in back of the cap! 05+ Caps were held on by the lug nuts, and is a simple matter of pulling the lugs off and swapping the caps.
To go from this:
to this:
Here's what ya need...
Set of factory center caps from a set of 16" steel rims
Set of Cragars
5/16" socket
Drill
1/8" Bit
1/4" Bit
Scissors/Knife
Snips
Cardboard/heavy paper for template
Pen
Tape
Beer
1.) Open the beer, your about to drill holes into those perfectly good, pretty Soft 8's. I justified as a being used to "steady the nerves" so I didn't miss drill.
2.) Grab the new (old) center caps, start by cutting off the two tabs on the rear of each so that they sit below the plane and wont touch the wheel when mounted.
3.) use a piece of cardboard, or cardstock and trace an outline of the center cap with at least 2-3 holes marked also. You will also be able to feel the mounting holes for the three screws though the cardboard, mark these. Cut the template, and holes, and use your 1/8" drill bit to poke a hole for the mounting screws. Once your done, tape it down to the wheel, using the lug holes to align the template.
4.) Another drink of beer, hold breath, and drill the first pilot hole with the 1/8" bit. This was the hardest part... Holes 2-15 become increasingly easier! Drill out the pilot holes with an 1/4" bit now.
5.) Mount the cap to the outside of the rim, start by threading the first screw just a bit to get to grab, followed by the 2nd and 3rd. Snug up with a 5/16" socket/wrench when all three are started. The 1/4 holes should leave enough play in lining up the screws to correct for any little bit you are off with on the template.
6.) Knock out the last 4 rims, and walla! Remount and enjoy the goodness in the world that results from completing a cheap, easy project that very, very few will ever notice.