I used a Powerline Commonwealth bogie on a Lima car with a minor modification - I got a narrow KFC straw (the ones from Maccas/HJ's are way too big), melted one end to form a lip and put it through the underframe (you need the roof off to do this), then cut it to size and bent the straw around the original Powerline clip. Basically, once you've got the straw inside the Lima bogie bolster, fold the straw in half so you have a "B" shape, this makes the holes just big enough for the bogie's clip to fit inside but not fall out when you lift it up. To get the correct height, I simply used some small hex nuts I had lying around (make sure the hole is large enough to go over the straw), 5-6mm wide nuts gave me the right height IIRC.
Personally though, I'd ditch the Powerline wheelsets for some better quality ones (e.g. SEM disc wheels or whichever brand you prefer), as not only do they make carriages roll like a cheap Tyco model and wobble around, the metal coating on the wheels flaked off my ones within a month or two of use. In fact, the cheap plastic Lima wheelsets even roll better in the Powerline bogies than their own metal wheelsets (although the Lima wheels are either 40" diameter or OO scale, one or the other).