I've noticed the front seats don't seem to have that butt hugging grip one might want. 
While driving, my hip would begin to hurt due to not having any support under my thighs and long drives would end up causing lingering pain long after we reached our destination. 
These molle pannel style seat jackers will fix the issue as well as provide a nifty storage location that didn't exist before. (3d printed prototype pictured)
They will fit the 04-12 Colorado's, Canyons, H3t and H3 and come with 2 panels and the necessary hardware to install. 
They come as raw steel so painting these is a must. These are a great way to add a touch of style to your truck while increasing the available storage.
Kit includes 2 panels and hardware to mount for both seats.
These currently only fit manual seats.