If he's "misplaced" it Edward it's possibly not that one. I suspect it's the rubber apron.
[member=3824]dwh87[/member] can you tell us from the photo attached, is it the piece crudely drawn around in red, or the one in green? If the one in green, do you still have the part drawn around in blue?
Also, once we know that, can you tell us the T-Nr. number on your Kapex. Again, in the photo attached, mine would be 495776.
Once we know those we should be able to point you in the direction of the correct part number.