You will find the K&N part number in this thread. I have fitted this to my 2011 4/4 and other 4/4s of similar vintage.

http://www.talkmorgan.com/ubbthreads.php/topics/400294/1


A Morgan Identified Fastidious Owner...
2011 4/4 Bespoke, 1981 Delorean, Auburn Boat Tail