I think some people need to chill a bit, the OP has obviously read posts and has tried to take everyone’s advice onboard! But the part numbers and belt sizes obviously don’t correspond with his setup. The thread I linked, the OP in that thread had same problem.
I would suggest putting it back to original factory setup, if possible take a picture! I would ring another Vauxhall garage and ask to speak with service manager and try and explain, giving him part numbers above and see if he has some info..
Also might be worth ringing Vauxhall’s CS and putting it too them
Other option is to check how much slack you have on smaller belt and take that to Vauxhall or a motor factor place and see if you can just buy one that’s slightly smaller and keep trying.
Hope you get it sorted
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