[Steve Tinker]

Breeze...
It can be a bit of a problem, but try these...

1) Are you sure that the two alternators are identical??

2) Make sure you position the electrical wires correctly before tightening, ie the lugs are not stopping the alternator being positioned in its correct position.

3) I removed the small 10mm outer bolt holding the (black) inlet manifold to the cylinder head as it was binding on the alternator.

4) I used a screwdriver through the locating hole (the bolt is a little too thick) to "pry" it into position.

5) If its still difficult to install, try disconnecting the wires completely, tuck them out of the way & THEN try installing the alternator temporarily. Those wires are really short and can impede progress.....

Let us know how it all goes.....