I had a bear (haha) installing the newer frame bushings into the frame lug. I ended up using A BFH....

no fun it was. To help w/ the second one, I ground down (belt sander) those serrarated portions (all round) a little and the install (hammering) went much better. the origional ones are a little different than the new replacements. I also used the old screw in piece to set the new bushing. Getting the old one out was fairly easy with the same sized drift.
my.02