air con help please

[brianhepb]

so i have a 1995 granvia 3 ltr 1kz-te 

i got the air con regassed today but it was squealing really bead and when got home i looked to see what was going on and the  air con belt was not running around smoothly more jolting and was advised to try revving to 2-2500 which did kind of work when took foot off no squealing but when revved to 2k it started again and this time there was a crack noise and when looked found the air con belt had snapped. so now i have problem trying to locate the correct belt and also how do i get it on? i assume it wont just fit over the fan? is anyone got a plan or can give me step by step how to do this please. i also assume it maybe the compressor but obviously cheaper to try replace belt first i would say it apparently been out gas for over a year. the belt that was on has details on which i still cannot locate one maybe someone can help the details are mitsibishi LA450   V98DLA450. I would apprecaite any help i am not mechanically minded and if any member in or around milton keynes wants to help that would be even better, thanks