Hi Joe , see you haven't got any replies as of yet, I put mine in with the desire to not hole the hull , I used grade eight 7/16 bolts and self locking nuts with flat washers and mounted them to the seat tube frame , low on each side. in addition I put in shoulder harness and sub belts mounting the shoulder harness to the fuel filter mount bolt location and the anti sub belt to the lower tube of the seat frame between my feet, , works fine, and the real advantage is that it all comes out with the seat, Some would argue that it doesn't offer much protection, its better than nothing and will keep you in place off road, in a collision with an 18 wheeler ? your only 18 gauge aluminium away any way! Andy