99% of the time the only size allen bit sockets you'll need on these old MB's is 5, 6, 8, 10, and 14mm. You'll never find a 7 or a 9mm allen bolt, at least I've never needed one.

Motor mount swaps aren't that bad in my experience. You just have to make sure to disconnect the engine shocks from the engine shock mounts, or you will destroy the shock mounts. And also make sure not to cross thread the 8mm bolt that comes up from the bottom of the mount.

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