Yes to the draglink, but as far as I know they have not been available for several years except in some dark recess of a warehouse somewhere. So what you have has to be the new "correct" or you'd just be stuck with a 50 year old and likely worn out steering linkage.
Better incorrect and working, than correct and crap.
Besides, you didn't say it was a religious restoration. Just that it's being fixed up.
I would renew the rear springs if you're going to drive it much. The originals have sagged just enough to be sitting on top of the bottom overload leaf. This is killing what is already a stiff and harsh ride.
Options are to have the originals re-arched, or remove the bottom thick leaf entirely, or add a single leaf in the middle to shore things up a bit, or replace with a whole new pack.
Some vendors still sell the original style replacements, so new is not necessarily something that a prospective owner would notice if that was the case. But if you're looking for that last bit of value, a re-arched original set might gain you a buck or two.
Most buyers don't seem to care about absolute originality, but since yours is a '66, and a U13 to boot, those little things might make a bit of difference.
As a driver, a modern set of leaf springs will ride better and be safer with their double-wrapped spring eye in the front. Not that you're likely to ever brake a main leaf with your intended mild use, but it's there if that advantage is ever called upon.
And be aware, that if you opt to remove that bottom leaf, you might lose more than just it's thickness in height. If your other leaves are just too weak, they'll sag because the big thick one on the bottom would have been holding them up.
Paul