The 123 is the first car I am aware of with the straight up hood set-up. Perhaps the 107 was first?

The 110 had a hood pad if you wished to spend a ton of cash. it was held in place with a set of thin metal rods that ran from the front of the hood to the back, sort of at an angle. I think there were four of these rods. Think of a big 'W' sort of arrangement.

This was something the dealers pushed on those buying a diesel for the first time to reduce the clatter. This was around 1963.

See if you can find this wire contraception on line somewhere. It would be easy enough to make one out of some long dowel rods, rods that would hold the pad in place while the glue dried.