The wiring is very straightforward as there are the same number of connections and the wiring diagram is the same for each.
I had some very good lights a few years ago made by 'Autopal'. I don't know if they are still available, but for road use they were excellent. I even used them for rallying with 100 w bulbs. I now use either Cibie or Hella, which are simply the best, but Autopal runs a close second. Check them on Ebay.
I bought a set of Autopal halogen lamps for about £26 yesterday from Minispares in Huddersfield. They don't look *quite* the same as the old sealed units, but they throw out a lot more light. Simple to fit.
Bernard