You are lucky, actually, they both appear in the catalogue. And yes, any mk2 diesel covers will fit. They're the same for the JP, ME, JR, MF, RA and SB engines.
Upper cover seems to be about 20 bucks and it's ref: 068 109 123G, available in the USA and Canada (as far as I know).
Lower cover is about the same price, ref: 028 109 127, but seems it's only available in Europe, I'd give it a try, though.