You guys need to wedge open the spring eye with a screwdriver or chisel so the bushings can be pounded out easier. Also, lightly lube the sides of the aluminum spacer with antisieze before install.
You dont need a press, just patience. It doesnt take long to install them with a sledge and a socket. Maybe an hour or so tops, for both sides.
Chris, I had the same problem with my bars once I took the overload out. It "shortens" the springpack, so the bars are now 1", maybe 1-1/4" too long and they have very little adjustment, if any. Probably have to call Calvert and ask them if they can make shorter bars, and if they would be willing to trade the parts out.