That's normal. Polybushes go into the beam (or semi-trailing arms, or where-ever) but hardly go out in one piece. Maybe the new ones are easier because they are 2-piece items since, well I don't really know.
AFAIK polybushes are only sold per pair. At least, all the Powerflex items I've bought for my project car were packed per pair.

The pin Nick is referring to can appear to be stuck. Don't hit too hard because you might lose it. I almost lost mine last night when I was fitting the cable. Also take care not to molest the c-clip. It's very puny and fragile. The problem reaching that pin is that the prop is in the way so could be tricky to reach. Maybe if you have really small hands.