Jeff, Came across this on CL and thought it may be an option for you? I actually sold this guy the OM606 IP he mentions (came off a '99 E300 my brother had). He's a real diesel buff, converted a 90's Land Cruiser into a diesel, a Cummins I believe.

Mercedes super turbo diesel engines

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*1985 300CD, 214K miles, Pearl Black/Palomino MB Tex-Stuck in FL
*1985 300D, Smoke Silver/Palomino MB Tex, 280K miles--Dad's car--Sold May 2015
*2014 VW Jetta SportWagen TDI Premium Pkg, Platnium Grey w/Black VW Tex- Dad's new car- 55k
*2017 Chevy Cruze LT Diesel, Silver w/Black leather, 26k miles, brother's new car
*2017 Chevy Silverado 1500 Z71 Crew Cab, Pepperdust w/Black leather, 15k miles, my new ride