FWIW, I also use nylon washers on the hood bolts of my cub and they work really well to keep vibration down and the hood stays exactly where you put it just like the picture shows. Interesting idea about the cork in the back. I still have a little of the remaining rubber strips on mine but they move around a lot with the vibration between the hood and the dash.
Thanks for all the feedback on the front bumpers, I'll try some heater hose next time I work on the cub. As for the 1x2/3, I've never seen anything to dampen the hood on the front of them but I'm certainly not the authority on the subject.
Steve S.