The Corbeau Audi A4 Quattro seat brackets are manufactured to be a direct bolt in to the 1996-2001 Audi A4 Quattro (small engine). Direct bolt in means your bracket will bolt to the existing bolt holes in your floor board with little to no modifications. These were designed to fit all 1996-2001 Audi A4s with a 1.8 liter motor. Corbeau Audi seat brackets are powder coated in a black wrinkle finish and come standard with single locking sliders. Single locking sliders have a handle on the locking side that you pull to the side to slide your seat forward and back. You can upgrade to a double locking slider for an additional fee. Double locking sliders have a bar that connects the two locking sliders and you pull up on this bar to slide your seat forward and back. If you do high stress driving of any kind we recommend a double locking slider.