This Backrest is specially designed to Not intrude on Riders space, while still giving wonderful support in the Lumbar section of the Spine. No labor or mods needed. Larger riders love its support and because it doesn't take up any Riders space it works on large or small bikes equally. It simply attaches to your seats passenger strap. Now its possible to really lean back and enjoy the ride no matter what bike you have. Passenger strap is required for installation. We sell passenger straps if your seat doesn't have one. All of our backrests install & remove in seconds and stow away easily.