I know these are old threads but for anyone reading, I'm having same issue/conclusions and need to get in there and do a k1 and maybe k2 before I do anything else, now if only could track down that elusive k2 part number! anyone have it POST it please!

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-SpecialDelivery
1985 300CD Silver/Blue H&R Suspension (Sold, still cryin over that)
1982 300SD Silver/Blue '85 OM617 (Sold)
1982 300D - Blue/Blue (Sold)