If going for the 307 one it's just the pulley that you need.
I tried a fair few types now from OEM from the dealers and patten ones and the one thats lasted the longest was a cheap one from GSF. Sorry I can't remember what the make was as it was over 4 years ago when I replaced it last.
The pulleys are available from Eurocarparts as well and it's best the replace the belt at the same time as it's been know to take the cam belt out if it goes.
I tried a fair few types now from OEM from the dealers and patten ones and the one thats lasted the longest was a cheap one from GSF. Sorry I can't remember what the make was as it was over 4 years ago when I replaced it last.
The pulleys are available from Eurocarparts as well and it's best the replace the belt at the same time as it's been know to take the cam belt out if it goes.