i just picked up a 99 tahoe. i'm pretty sure its a base model because it has the square headlights. i want to change the front to either the more common tahoe grill and lights or maybe even one from a yukon. is this possible and a pretty easy swap? i found the grill as well as headlights, is there anything else i need? another thing i'm unsure about is if the harness for the headlights will match up to the new housings. thanks in advance.