There are two mirror styles, so-called 'bullet' type and the later 'scullcap' design. The names are used to distiguish the shapes of the body-coloured or chrome trim covers.
The later design was fitted around the time of the facelift (2004-ish) so I'd have expected yours to be the bullet style. Anyway, the mirror glasses have different shapes.
There's a useful How To on servicing mirrors here:
http://www.the75andztclub.co.uk/foru...ight=scull+cap
TC