GMFS founding member
just took delivery of an '04 sierra SLE 4x4 with the "custom cloth" seats. i ass-u-med they came with lumbar support, as every GMC i've ever driven has the familiar knob on the side of the seat. however, they have no lumbar support. these seats are terrible. they're too soft and unsupportive and my lower back hurts badly after a 120 mile trip. i was used to the soft seat in my tundra, but these things are a joke. where can i get better ones?