The original question was, how to remove the amber from 1999 headlights.
In my case it was a Chevy truck that backed up into me at a stop sign a few years ago - for some strange reason. That is one way to remove the amber.
I had all amber lights and I had no problem with amber on my 1997 artic silver.
Due to the "sudden" change of events I made a plan.
A friend in Germany gave me the clear tail lights, US version, about a year or two before the crash. When they first came out and it was hard to get the clear tails in the US, but he had a connection. I put the boxes away for a long time.
I told the body shop not to replace the amber headlights as I wanted clears. Instead, I was given the money. I passed on lits and the 2003 Boxster clear headlights.
My 2000 friend had put in lits, so I borrowed his old amber headlights for 4 months while I searched ebay for cheap 996 clear headlights. I drove home from the body shop with his headlights.
Then I found and put in 996 clear headlights. Then put in the tail lights from the boxes. Then I bought the clear side markers.