That is something that I hadn't though of until now and did make a big difference to mine both in hardtop form and now its station wagon configuration. On the floor of the rear load area (and second row foot well in the station wagon) I have 12mm...
^^ These cannot be stressed loudly or hard enough.
On my 110 I have replaced as much with stainless as possible and everything is copper greased before refitting. I have just pulled apart a very rusty 110 to swap the station wagon body ono mine...