Its on the front leg of the chassis, under the wheel arch..on drivers side..probably covered in poo, waxoyl and badger blood...IF it has one..sometimes they disappear if theres been welding done.
If you cant find it...then its illegal to buy a tap-die set and make a thin plate and weld it on..covering it with waxoyl again etc etc..i would never do this or recommend that you do this, never ever.