You can buy a rivet tool for solid and semi-solid rivets from a number of sources. I found several in a Yahoo search. The tools are expensive, $200 and up, and you need to buy two dies for each rivet head style ($30 each). I've had mine for five years and used it on mostly 65-66 Mustang items, ash trays, grills, but it was also purchased to restore WWI and WWII rifles, and some vintage electronic equipment I have.
I did find a better way by using an arbor press from Harbor Freight ($45) and the dies I got from the rivet supplier along with some adapters, posts and steel blocks I made. The salesmen at "jay-cee sales & rivet inc."
www.rivetsinstock.com 800-521-6777 walked me thru the purchase of what I wanted; type (semi-solid), material (steel) head style (oval) and head dimensions (dia, height) and most important - grip range, materials thickness and the crimp roll.
One problem I did encounter was on the 67 style ash tray; I can get them apart but I haven't figured out a way to crimp the face plate back on - yet.
I'll take pictures tomorrow.
Jim
Added pictures of my rivet press with a 65-66 ash tray sort of in process. Pic 004 shows the detail of the "head" I made to fit the press (in the foreground) with a 7/16-14X3/4 bolt used as a holder for on of the dies, and a longer bolt with a die on a plate to crimp the rivets. Just be creative and you can figure out something.