-W210 E270 CDI 6 speed manual transmission is available as we ams 5 speed autos. Here's a post that provides some good info for your type of project



93 300d 2.5 Turbo OM602 6 speed swap

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Stable Mates:
1987 300TD 310K mi (Hans)
2008 Jeep Grand Cherokee OM642 165k mi (Benzrokee)