ive seen these before, i had to change one on a peugeot once but their shafts aint like normal ones with circlips. after spending ages getting dirty stripping it down i was left with 3 prong type things and still couldnt get the boot over them.
popped down to the garage down the road and he had the universal stretchy ones that he put on an air tool that opened it nearly enough to get it over my head let alone over a cv joint.
only charged me 4 quid for it aswell and gave me the grease and clips too.

worth sticking ur head in ur local garage chip, if they have them and the tool will make life even easier for ya and wont have to pay any postage or anything.