Welds seemed solid, wrinkle finish was nice. The Corbeau bolt pattern is 11" side to side, 13" front to back.
Instead of three mounting points per rail, you get two. One front, one rear. I plugged the remaining bole in the floorboard with another nut/bolt. Instructions say to install the brackets first and then install the seat. I followed the destructions the first time and decided they were dumb. Install the bracket to the seat first then install into car. Much easier.
I sandwiched the seatbelt bracket under the rear mounting point and added a few washers on the opposite side to keep it level. Perhaps a little obsessive but it would bug me if I didn't...even if I couldn't feel the seat tilting 1/8" to center.
Here are the results:
