I have seen the post on belt removal but do not understand it. Can I simply use a 17mm to relieve the tensioner on the belt? It mentions a torex but what part does it play in releasing the belt tension?

any help will be appreciated

Also I am looking to replace the a/c clutch and it has 8 grooves instead of 6 like the regular XF. Any ideas where i can get one. The part # would be invaluable. It would be easier that just replacing the bearing. regular xf bearings and clutches are very easily located but not srt