Made some temperary bolts from 9/32" steel rod. One is shown in photo 2 on the far left top side. I used six of these to originally get all the holes aligned and ready for permanent bolts. Bottom 3 went in fairly easy with just light tapping with rubber mallet. However the bottom outboard bolt was more difficult because there is very little room to get any type of a tool to tap this bolt in place. Also on mine, the outboard L angle that reinforces the bottom seat opening was too close to the outboard hole so the bolt would go in the hole but I could not get the nut on it. Picture shows this hole with steel rod in place while I worked on the L angle to make room for nut.