I am just about to buy a 2005 model Barchetta from UK for permanent registration / use in France. Is there any difference in the headlight units between these and the earlier models and is it still possible to dismantle them and reverse the reflectors as my pal has done with his 98 model, or will I have to buy new European lights? If new ones are required, anybody recommend best place to purchase them.
Thanks for advice, in anticipation.

all models have same headlights, you can reverse shade plate inside.
check this thread: https://www.fiatforum.com/barchetta/259595-spanish-plates-changing-headlights-rhd.html

for buying new (used) you could ask Henk from http://www.barchettaparts.com/

Jus the older models have the black plastic inside. the newer ones, think 2002 have the chrome look.

I have just changed my headlights from UK to European. Easy job, you need to turn the angled plate inside 180 deg.