I received a tip via a forum member that the P2 chassis Volvo’s (S60 / V70 / S80) have builtin US lights functionality. The EU models only need a different bulb + bulb holder for the side indicators.
Looks absolutely great in combination with the projectors.
Partnr: 9178546 (bulb holder)
Partnr: 989790 (amber p21/8w bulbs)