Has to be removed to check i dont think you will manage to read the part number off without taking it off. Only problem with that is you will need to refit the part and go through it all again or buy in advance not knowing if its needed, being an 05 and if its been in normal hands (not a forumite) then its probably on its original one and will be diaphram. My 05 reg was MY06 I changed mine over despite no damage car felt different afterwards worthwhile doing and good to do it yourself.