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Mine mounts at both ends, because I got my alt off a big (3/4 ton?) Cimarron truck in a junkyard, and it had a two-inch tube that was bolted on to the alternator near the non-pulley end as part of the Cimarron's mounting apparatus. This truck was from the mid-70's I think. If I hadn't got this particular junkyard mounting stuff with the alternator, I might not have kept the stock bracket. But I did, so I will tell the story and you can use your own judgment.
I took a grinder to the end cap at the pulley end, to allow the pulleys to line up (fan and alt). I needed to move it toward the back of the engine. So I was grinding aluminum off the mounting hole on the end cap. You might not want to do this if you're using only the one end cap for a mount.
Then with the alt correctly mounted so the pulleys lined up, I found the alt was tipped too far away from the block and the adjusting bar (slotted bar) wouldn't reach the adjusting bolt in the end cap. So I removed the rubber grommet dealies from where the bracket bolts onto the block. And I replaced these with some metal washers. Each hole has two washers. One is shaved to size and driven into the hole to center the bolt in the hole, and a second one that is bigger than the hole, and which snugs the bracket against the block.
This helped but wasn't enough. So I looked at where the alt was hitting now, and it was hitting the bracket when I tried to tip it toward the block. So I took the bracket off and did some grinding on it...and repeated this step a few times until the alt would go into place using the stock adjusting bar. And I could tip it up enough to slip the belt on and off and then tighten it in place.
This was 8 months ago. No problems. Except it only charged for about five minutes and then quit so I had it rebuilt. Been working fine since then.
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