Some parts guys are bloody useless, the part number you require is:
027 121 133A - 32.31+VAT
I'll have a look in a bit, I'm sure I have one!
The code will start PB, it should be written on the boot sticker, or on the inside cover of your service book if 1) you have one and 2) the dealer wasn't a lazy bastard. Mine only has my vin written in, nothing else

Its also on the front of the block, but since its not the original engine it could be anything!