alternator pulley issues... 1979 300td

[peachykeen]

I have a 79 300td with an alternator that does not have the original pulley on it...

I bought the correct belt using the VIN -- and there was no way it would fit length wise...so I found one that fits, but can't get it to stop squealing now even after adjustment...

I've noticed that the belt has sunk pretty far down into the alt. pulley....maybe the pulley itself is the problem??

I'm 99% sure it is the belt as I've used some belt spray conditioner on it and it did quiet it for a bit...now back to squealing...

Any help/tips where I should go with it next?? Thanks...

cheers