Bolts are a little short but fit ok in my boat. I ended up getting some wood grip nuts for the underside because they are easier to install. There isn't any way to hold the nuts in place while installing the base. The wood grips bury into the wood on the underside of the plywood and stay in place when installing the bolts. Drill the holes to match the base; hold a nut under the hole; install a short bolt and tighten it to insert the barbs on the nut into the wood; repeat it for each nut; then install the base and tighten the bolts. It works great. My recommendation would be for Cabela's to change the nuts to a wood grip type of nut.
I would have what I would call regular mounts. Stainless steel 7x7 mounts with a 3/4 inch hole for the seat pin. This hardware isn't even close to fitting, its way too large. Now just sitting in my garage.