Into my mk1 fabia vRS? or what else would i need?

If its the one from a lupo then yes i think it will fit.

I have one (not installed), you'll need a half din tray to go with it, but yes it fits. I prefer the side one and keeping the bottom din as a drawer.

_{How does it fit in? this one was from a golf seemingly!}

Um.. you slide it in, and clips will latch.

but it needs the half din cubby hole to bulk up the rest of the hollow space otherwise you find when you put a drink on it, the unit will tilt and you have wet pants.