Other than buying the 2001 lights is there anything else I need to buy or change to fit them on my 2000 GS
Lexus Fanatic
welcome and make sure you get the harness
check with our CL vendor www.l-tunedparts.com for the best price
check with our CL vendor www.l-tunedparts.com for the best price
You can get the Junction Produce tails 
Driver School Candidate
I got mine through l-tunedparts.com, and harness, and light bulbs were included. Everything was plug and play.
Lexus Champion
yeah man, carson has them for a decent price, theres also a guy on ebay that REGULARLY sells these 01+ tails for $235 + $50 air mail shipping or $55 for express..and hes including everything needed, bulbs, harnesses, to make these a direct swap...they are all brand new in box too..i just got a set from him this week.