I have got a howling fan belt on a Y30DT Vectra C Estate 2004 3.0 CDTI. I am thinking of changing everything, belt, belt tensioner, pulleys

Is there a guide on the forum about doing this? I know you can get in there by taking off the front right wheel and covers. Can anyone confirm the part numbers of the pieces I need?

The belt tensioner is on eBay with OEM part numbers of 5636741, 636591, 97312462, 97383061, T39258

It looks like the deflection pulleys are part number E2X6411BTA. Are they both the same or do i need 2 different ones?

Is it best to change the alternator pulley at the same time? Is it a hard job. Is it part numbers 56420, F-234563.04, GA753.01, ALP2377, VKM 03503, 235477, CR 3600, F-234563.01, 535008510, 93182514, CCP90164, 622041, 5543814, 93175986, F-234563.02, 5340393, OAP7099, F-234563.03, CCP10127, F 00M 991 189, 1204378