Exactly as Piggy says. Just make sure it's the 2.0HDi 8v 110bhp, rather than the 1.6HDi 16v 110bhp.
There's a couple of guides with pictures in that should help make sure you've got the right one.
The only other option besides that is going custom, which gets expensive very quickly.

The only other option besides that is going custom, which gets expensive very quickly.