When you say "adapters for the lights" are you meaning the wiring that runs from the vehicle to the trailer (or whatever you're towing) to power your turn signals & brake lights? I've looked for a 4-way flat, sometimes called a T-Connector online & I'm having some difficulty finding one for the 05 RX. You might need a taillight isolator or a convertor. I'm still looking... If I can't find something online - you might want to contact Lexus to find out what you need. If it is an isolator or convertor of some type, that will be available online. You can also check with any local truck accessory shop - they might have a quick answer. Will let you know what I find....