I installed the seat belts. I had to open the slot a little on the forward floor panel to clear the buckle on these betls. These belts are an upgrade from AeroClassics. They are 5 point with a crotch strap. Pilots say crotch strap is actually more comfortable for long cross countries. I also used a 7/8 bolt rather than 3/4 per drawing. Didn't seem like the 3/4 was long enough.