I plan to order the leather seats from www.leatherseats.com and while I was having a shop (or a number of helpful friends) install these, I thought about adding some seat heaters to kill two birds with one stone. I'd like to buy the OEM seat heater switches that go in the center console by the e-brake as well. Has anyone done this? Is it easy to install the seat heaters themselves...what about the OEM heater switches?