I did mine with Pirelli webbing recently. You'll need to drill the front and back rails to take hooks, if you want front to back as well as side to side support; the Morgan type only clips on the sides. I used the old side wire to make extra hooks, or buy more... Be sure to clamp the ends in a vice to grip the new rubber. And dont over stretch, (>10%) the rubber will tear!
Good luck with it, Phil