How the hell do I get that thing on there? I cut the old one off to replace the alternator belt (which was a pain with the A/C compressor in the way but I got it on there eventually) and now I can't get the new one on. I loosened the bolts in the slots on the pump and the one on the back, it swings as far as the little slots on it go but that isn't quite enough. What am I missing?

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1973 220D ~135k Mi
1979 Ford F100 300 I6 - 225k Mi