It is real hard to trouble shoot this without being there.

I am going to guess that because the Brass/Gold Colored Bracket looks new that it is in fact new.
If the problem is that the Bolt is not going through the Bracket due to some misalignment of the Holes could simply be that you need to enlarge or elongate the hole in the Bracket so the Bolt will go trough it.

I think that the idea that the other Member had of using a smaller diameter Bolt with a Nut and washers would also work. In stalling the Smaller Diameter Bolt all the way through both sides.

If you send it to a Mechanic He/She is likely to do one of the things I mentioned or as to try a different Bracket.

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84 300D, 82 Volvo 244Gl Diesel