Unless I am misunderstanding the problem, it is the exhaust crossover pipe that the original poster was referring to, not a crossmember (although I am no expert on 124 cars).
Either way, as Chowpit said, the hex keys with the rounded ends are a great way to go. Harbor Freight Tools has them, and like all their tools, they are very cheap (both economically speaking and quality wise. But they work.
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