looks like he has a 91 YJ
Universal Mounting and Rear Mounting on Jeeps®
11303.03 & 11236.02 Tow Hooks can be mounted on any flat surface on any vehicle using the supplied hardware. Once a location is found,
use the hook as a template and drill (2) ½” holes in the frame for any two of the tow hook holes (existing holes in the frame can also be
used). Be sure to check for wires, fuel lines, etc. behind the frame before drilling. Bolt the hook (and optional safety catch) to the frame
with the supplied hardware. Torque to 65 lbs.
1987-95 Jeep® YJ™ Wrangler™
YJ™ Wrangler™ models require the use of the two front bolt holes at either end of the hook (See Diagram A – Holes # 1 & 3). The tow
hook can be mounted on either driver or passenger sides of the vehicle on the frame. There are (2) holes on the top of the frame: one
attaches the front bumper and the other is located on the front frame cover (frame cover may have to be drilled). Remove the existing bolt
for the front bumper and, using the hardware supplied in the kit, bolt the hook (and optional safety catch) to the threaded holes in the
frame. Torque bolts to 65 lbs
link for a tj, but you'll get the gist.
http://www.stu-offroad.com/guards/gas/tj_hooks.htm