I recently had a local exhaust shop fabricate an intermediate x-pipe out of stainless steel. While I was under the car, I noticed a series of speed nuts on the belly pan, that had nothing attached.

I originally figured these were supposed to have bolts and attach to some kind of rigidity bar to add structural support... But searching online says they're wind deflectors. Did all cars have them? Only certain years? Only with aero pack? The car below looks to be a regular 2010-11 XK with them installed. Part number says compatible with 2010+ MY all trim levels. Maybe mine are missing...

Here's a photo of the deflectors installed for reference:



Underside of my pan with missing defectors:


Part from jaguar (C2P19493 and C2P19494):

https://parts.jaguarenglewood.com/oem-parts/jaguar-lower-deflector-c2p19493

 

My 2010 has 'em, although beat up a bit. No aero pack or anything.

 

I think my 2007 has the nuts but no deflectors, kind of wondered what they were for. Thanks for solving the mystery.

 

They should all have them.

 

Just purchased from jaguar for $20 each plus $0.75/per for 8x bolts.