just because they dont have any in stock doesnt mean they cant get them, they can have you one within 48 hours easily unless its a france job which i wouldnt expect it to be
the only reason i can see why you might have a problem getting them is if they come in packs of 10, the dealer might not want to order it as they may never sell another one
i can bet Pollokshaws Rd (Scotland) had it in stock, they have EVERYTHING !
john if you ever do need one, i work at Arnold Clark St Helens in parts so give me a call, 01744 454330