I believe I was successful in using a 240d slave cylinder bc the one for a 350sl is so expensive or NLA or something. The original pushrod is required though (I believe).

Somewhere on Benzworld I documented replacing the slave cylinder on my 1973 350slc. https://www.benzworld.org/threads/1973-350slc-4-speed-11-2019-purchase.3040336/

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Past mb: '73 450sl, '81 280slc stick, '71 250, '72 250c, '70 250c, '79 280sl, '73 450sl, parted: '75 240d stick, '69 280s, '73 450slc, '72 450sl,