Not my K10 or square body comment but felt like saying making it. Had to install a new Drivers Side Heat Door Actuator in a 2010 Impala and it really makes me appreciate changing parts on my 81 K10. The Drivers Side Heat Door Actuator is a plastic part made in China (both the OEM I took out and the GM Genuine Part I bought) and it is located on the drivers side in a very difficult spot. There are also some on the passenger side that are much easier to get to. Had I let the dealership do the work it would have been $700 to get the $31.10 part replaced.