The most important grease points are the on the stub axle between the top and bottom bushes, as long as these are both kept well lubricated you won't go too far wrong. I do these at least every 1000 miles , and usually much sooner.
Some folk try to prise the damper blade up with a pry bar , or large screwdriver, and make sure that the underside is also coated with grease, this is much easier as a 2 man job.
Secondly there is the top bolt (on the top of the king pin), many of us have converted the one-shot oil lubrication to a 90 Deg grease nipple, just keep this one topped up occasionally.
Outside that, the prop shaft nipples are incredibly difficult to reach (good luck with going underneath, and make sure the car is on axle stands as well as your new trolley jack) .
1997 could have been the changeover year from Salisbury to BTR rear axle. If the latter then no grease nipples , if the former then just a couple of pumps into each one is sufficient.
As well as the greasing it is really good practice to look around the front suspension, the front of the engine etc while you are down greasing , this enables you to spot issues early on and put in the remedial maintenance before they become serious.
