I "think" these are the correct numbers:
RHJQ 10013LOY
&
RHJQ 10014LOY
Techie name for them are escutcheons, BTW.
You'll need two of each (one has the locking button, one is plain), its been a while since I bought mine but can remember them saying when I ordered them if they were incorrect that I could change them - since I bought them I assume they were right!
Worth having a look here:
http://forums.xpowerforums.com/showthread.php?p=451351
Heres a pic of the right ones.
HTH, did you get hold of some headrests then?