i am also looking to buy. i seen some bolt on for XF going for $2,100. but universals can go as low as $800. i've seen there also is a few different angles. like 130 degree or 90 degree. 90 degree is straight up, and looks like it have super clearance, compared to the 130 degress, where the door is still halfway in the way. also did you install them yourself or had it professional? i know you have to cut and splice in extra wire length for all the wires. I think i'm gonna order my set within 1 month and install them myself. think it will turn a few heads in the parking lots at college.