My guess is they are a direct bolt-in. My reasoning is, there appear to be roughly 26 red LED's on the tailgate lamp and about 20 on the side lamp. Most likely, the LED's are connected in series, so for a typical knee voltage of 0.7v for each LED, and you'd get 18.2v and 14v drop on each lamp if each were connected to a single DC supply (ie, more than 12v). This implies there are more than two 12v power connections w/ a resistor in series for each connection (total voltage drop should equal 12v, and we'll assume it's regulated). That means either the lamp itself needs to include the resistors, or it would have to be included in the harness between the lamp and fuse box. Chances are, the latter would have higher production costs (2 different harnesses to stock) while with the former, the lamp is a completely self-contained unit.