on my ph1 setup i found the older PAS has a larger pulley and uses - 6PK1145
and the other (newer style?) PAS pump uses - 6PK1130
the 6PK1145 will work on both but your at the end of adjustment as the belt is just that bit too long.
and the other (newer style?) PAS pump uses - 6PK1130
the 6PK1145 will work on both but your at the end of adjustment as the belt is just that bit too long.