I used Protract SS rivets on my car builds and my trailer build.
I know I've been told about the corrosive considerations between SS and aluminum but I factor in the environment we operate the cars in. I am sure my builds will last many years, not driven in winter snow or slush, or salted roads, polished and waxed more often than I want to admit, keep dry most of the time, and most of all, there will be no recalls on 1000's of my cars because a few of them had corroded rivets of which I had no control of how it happened.
The most common sizes of SS rivets are the 304 1/8" SS XX42 and XX43 lengths, the XX43 length used where the aluminum panels overlap each other on the .065 tubing. I add that all I use is .040" aluminum on all of the car.
And, a very good investment that will make you smile just as much as driving your 7 is buying a pneumatic pop riveting tool, unless you like your arms looking like Popeye