I have a '76 Aspen wagon with a 318/auto.

The previous owner installed an incorrect starter motor (which appears to be this). The back of the starter interferes with a brace that runs from the transmission bell housing to the engine block. He was able to jam it in and it worked for him, but it bent one of the studs and started tearing up the flywheel.

What is a good replacement? Rockauto suggests I use this, but it looks very similar to the previous one which doesn't fit.
Are there any universal LA starters that you guys can recommend? Are there any starters off of later LA or Magnum engine cars that I could use?