Not sure about anything Harry, but on my 80" there are some pop rivets on the rear body and they appear to have been there since it was made.
Solid rivets need a rivet-set, which is the name of the tool which knocks the panels to be riveted down and it also has a female dome to support the head. The rivet stem is thickened by upsetting it, which means hammering on the stem to thicken it, while supporting the head.
I bought a pneumatic riveting tool to do the upsetting, where I can't swing a hammer,
Cheers Charlie