Here is how I did my alternator belt, might help others.
Not sure if it will work, only one way to find out when engine goes in.
I used a 1.2 8V alternator elongated bracket thing then flattened it down a bit in the vice till I was happy with it, then tension it with a bar and tighten up.
Had to trim it a bit at the top because it was catching on the throttle body.
And belt I used.