I was going to do what you did, cut my bumper to fit the 01 lights. but the halos looked ricey to me. just personal opinion. so i did a retrofit.
FX35 w/ FX R lenses. 85122 bulbs w/ denso ballasts.
second one is with switchback LEDs. taken with iphone 4, so it looks blue, it's white IRL.
white when on driving / parking mode. amber off when turning.
I had a old retro with halos that i connected to the parking lights. so when the parking lights were on, the halos were also on. parking lights off, halos off. just like yours.