I put a WRX pump in my 95L, for the 3.0 liter engine.
Yes, it does "bolt on". No, the wiring does not "just plug in", you'll need to crimp on some new connectors. And the rubber bumper at the bottom has to be modified. I threw on a few zip ties for good measure. Who knows... maybe they're dissolving right now!
Survived one rally so far.