Dunno if you tried this, but you could visit Gernold Nisius of SLTechw113 in Arundel, Maine. He is the US dealer for Mechatronik, and he has a demo car with a 3.2 in it.

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Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe