Alternator Pulley?

[GooglyBear]

On thursday i shredded my auxiliary equipment drive belt.

My mate fitted a new one on friday, but while he was on the job, called me to say that he thought that it was the wrong alternator that was fitted, as it was out of alignment. He suggested that i would get roughly about the same life out of the new one as the last one (15 months, 12000 miles i've run the car for with no other problems).

Suffice to say, the new belt was already on its way out when he got the car back to me. I took a couple of pics with the intention of posting here to ask for help. I started the engine to raise the suspension to full height, so that i could get some from underneath, but the remains of the belt slipped off the power steering unit at the top, and stopped turning.

Has my alternator pulley seized?

I've seen an ad on ebay for a Citroen/Peugeot parts dealer based in Heathrow who sells the pulley for around £40, but i note that the pin is not included with the part.

I'm no mechanic, but surely if the pulley has seized, the pin would be at least part of the problem, would it not?

 

I note the post in topic Auxillary Drive Belt Diagram Needed Please, but does anyone else have experience of this?