Darn GM and some of their body fasteners...

I have two aluminum "banana peel" type rivets which I need to set, which have a 1/4" shank. Most tool & hardware stores only sell riveters which can handle up to a 3/16" shank... Ottawa Fastener Supply has a monster riveter, however forking out $200-$300 to set two rivets is a bit excessive.
Does anyone happen to have a 1/4" riveter which I could borrow, or know where I could rent one from?