Help with Ride Tech suspension

[groove22]

I have ran into a minor snag with my truck. I'm at the last part of the suspension tear down on my 68 stepper. The cross member that's located under the cab has 2 rivets that are one the top of the frame and difficult to get to. Without removing the cab does anyone have any suggestions on how to remove the rivets? These are the last 4 rivets before I start the rebuild so any help would be greatly appreciated.

Thanks in advance,
Allen