An ebay seller named davidneuberth has a white one for sale right now that is the same (almost) as the one in question. His looks the same as yours, except it appears that those short posts have been cut off. Unfortunately, his ebay ad doesn't have any specifics as to what model. Perhaps you can contact him for more info.
1960's Mercedes Benz Center Console Seat Insert White W110 W111 W112 W108 W109 | eBay

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1968 220D, w115, /8, OM615, Automatic transmission.
My 1987 300TD wagon was sold and my 2003 W210 E320 wagon was totaled (sheds tear).