I just got a '08 JK a week ago and from my past experience of catching a bad rock that fudged the radiator of my '02 TJ, I thought I should protect this one some how..
I googled around and saw what was available product wise and said screw this, I'll do it myself.
Went to home depot and headed over to their chain link fencing and such section and bought a roll of this: PEAK
Hardware Mesh - 36 inches x 15 feet - Black
The squares are 1/2” x 1/2”.. black plastic, won't rust.. Easy to replace if f'd up over time/rocks.
Headed over to the electrical section and grabbed a bag of zip ties and a couple bags of these MARR UV Black Mounting Base - Bag of 8
These are like stickers, you peel the backing off, stick them on and use zip ties that go through them to secure wire or whatever.
I cut 7 separate pieces of the mesh at 3.5 inches x 12.5 inches but you could just do one big piece. I did separate pieces to avoid any possible buckling/bulging of the mesh.
You want to be able to work on the inside of the grill, so pop up the six or so 2-piece push pins that hold the top of the grill on. Tug on the bottom of the grill to unclip it free from the body. It can just sit there at an angle on your bumper.
I cleaned around the inside of each vent so the adhesive on the mounting base things would stick properly. Once clean and dry I stuck the zip tie mounts around the inside of each vent. Then one by one I took each piece of mesh and zip tied them into place using the mounting bases..
Snap the grill back on.. put the push-pins back in and done. Looks awesome.
It took about 30min and $40 Canadian.
I have a **** load of of the mesh left so I guess I will quit my job and start selling kits like a momo on eBay now.