I got my new air cleaner bracket in the mail, immediately went to put it in, but it doesn't fit! I can get the three bolts on the top side of it in, but that means the bolt for the bottom isn't lined up and vise versa. Then went to see if the air cleaner could be set on, and even that doesn't line up right. This should be a 15 minute fix, but I'm on my second hour of trying, mostly making sure I'm not just making some dumb mistake. But no, it simply doesn't fit. Has anybody else had this issue?

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1981 300SD, odometer stopped at 188,000