Stag headlight setup is different to Vitesse / 2000. It has dip on outer, and main on inside.
Best is to go to the Vitesse setup, dip on outer, main on all 4.
Best ones you can buy by a long way are Cibie, but at £200+ it is not a cheap upgrade.
I have purchased a set of the cheapo chinese ones from Bad Boy Classics, and they are not that bad, and a 1/4 the price.
Cheers
Colin