My neighbor loaned me my Gehl forklift for a landscaping project. Wouldn't let me rent it. Just told me to use it. The seat was in disarray. In fact, he had a folded bag of food to sit on. So I ordered this to replace as a surprise for him when he gets it. I had to stand the seat on heavy plywood and bolt it to the skid steer frame, but now it's rock solid and infinitely more comfortable! The quality of the materials is excellent. Rugged enough for harsh environments. Just don't leave your pliers in your back pocket lest you ruin the cover! Installation instructions weren't included, but if you have them handy it's not a problem. Center to center is 9 1/8 inches but there are extra holes for some adjustments. Multiple mounting holes from front to back along the rail. However, there are two adjustments at the back of the seat that could be explained. If there should be a sheet, I didn't get it. I'll look it up on the internet so I can give it to the best roommate a guy can have.