A note ref my experiences getting a tow-bar fitted to my 1997 4.0SE.
Like yours, mine had no previous fittings.
I got a complete original towbar from a breaker, including the swan neck.
Rusty of course, and it was a tricky job separating the swan neck from the cross tube.
I then had the cross tube bead-blasted and epoxy-coated but did not do the swan neck as the extra thickness would make it difficult to fit.
All fitted in place with stainless bolts.
Some wiring was there already, albeit unhelpfully all the same colour, but for convenience I used it.
I installed a 13-pin plug. The wiring must be right, as the indicator pilot shows correctly when trailer connected.
My spare wheel well has a formed slot for the swan neck, and it is easy to take it out and fit in place when towing.
Although, as I only tow light stuff, I use a Massey-Ferguson top pin and R-clip to hold the swan neck in place, rather than a bolt, much against advice in this forum. A swan neck that is rusted in solid, with an old bolt also rusted in place, is the more usual method.