When they switched to the MDS timing cover, the spacing on all the accessories changed. I learned this the hardway as my original alternator didn't line up with my water pump. The unit I'm using is for the later timing cover (totally flat where the WP mounts).

I'd have to check my notes for the year, but as soon as the timing cover became flat, and didn't have the water pump flow provision, the alignment changed. The case size, but pulley spacing, should follow this 160/180/220 size pattern all the same.