There are headlight conversions for 5001 and 5006 systems, but you will have to look around. There are two steps to improving your headlights:
1) Replace or upgrade the wiring to better handle the current.
2) Replace the sealed beams with Hx type lenses.
The easiest way to upgrade the wiring is to run new wire from the battery and use a relay powered by the original wiring harness to turn the lights on and off. This way you don't have to mess with the wiring under the dash.
Eurolamps (
this is a link) has a 5006 conversion on their web page. Call them to ask about a 5001 conversion.
I have an IPF conversion for H4 (which is a high/low beam combination), but I don't think IPF has any single bulb conversions.