The lugs are 21 mm on all 4th gens. Both of mine use the same socket. Various brands of sockets are snug when trying to use a 13/16. All suspension hardware is metric, some stuff bigger than 21mm, put on my lift over 6 months ago, don't remeber for sure. Many 10mm bolts/nuts under the hood. It does use a standard 5/8 Spark Plug socket if I remember right, been a little while since I changed either one, the 08 is due.
Get a full set of metric sockets and open end wrenches if you have not already. At least up to 21mm. Granted some standard tools are so close you can use them, 13mm = 1/2 inch ect... The racheting open end wrenches can be a big help when doing any suspension work. Make sure the set has a 14mm, some sets seem to leave that one out.:bluejump: