i bought an airbox off them once and they sent me a zetec one, made a phone call back to them and they sent the right one out straight away.
fair bit more work getting an rs2k lump into a mk4 than a zetec (ive done both) tbh may aswell do the 2.3 hybrid and fit that into it mate thats what im doing just need the same mounting as the rs2k engine. some people do it by making up a new mout from the cvh one or some cut the mounting plate off the chassis and make up a new one, thats what i did. only problem is height from the chain bulge, mines had the whole engine and gearbox assy lowerd by 10-20mm but still have to have the bonnet on raisers to stop it rubbing.