I was also under the impression that I needed to put wood under the steel dash capping, but as it turned out I was wrong - it didn't need any. The passenger grab handle attached with four large machine screws into clip-on nuts, and the tonneau cover pegs screwed down through the capping and into pre-existing holes in the metal top of the dash - they are mainly what holds the top of the capping in place. Underneath - in addition to the oh-god handle screws mentioned, the underside was held on with 4 or 5 additional small machine screws. No wood was involved or needed. Our TR3 VIN was 42071. If wood was used, it may have been on earlier cars.