I looked into this a few years back and its a pain !
There are a few problems - one is to get enough light out - for lightng up the road and NCT. If the lights are set too far back, then they can't light the road properly.
Another issue is being abe to adjust them for the NCT and having them sealed properly etc
The best by far, IMO, were a once off set by Ryan G years back. I actually got a second set of mounts from Ryan and I also had a set from Troy Trueleo and looked at trying to make up a set. Hard enough to find a lamp which will fit the small area and give hi/lo beam. I also looked at a twin lamp - with one angled slightly down for dip beam.
Anyway, it all gave me a headache and they were binned
At the moment, I am thinking to use 4"x6" lamps from a GTO and have low rise popups.
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