I found 16mm socket head cap screws in 8mm. They work great and don't hit the other bolts at all. However, I'm on Day 3 of installing this seat, and it won't be going in today. The problem is that the BK side mounts and hitting the sides of the shell. That keeps the sliders and adapters pushed out pretty far. In fact, they are about 3/8" too far apart. The holes in the floor at 16" apart, and the closest I can get the holes in the adapters is 16 3/8". I've got to call BK tomorrow. I can, of course, grind down the part of the side mount brackets that are hitting, but I want to talk to BK before I go to that extreme. I don't know if I can even modify things enough to recover 3/8".
Needless to say, I'm not very happy with the whole process.
I did find that by mounting the seat in its full reclined position (top holes in the front), compared to mounting it in the full upright position (bottom holes in the front) makes you give up roughly 2 3/4" of leg room because of the top of the seat hitting the roll bar.
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