Those are the arc-shaped headrests..... kinda like what you find on dentist's chairs. Imho, the coolest headrests that MB ever designed - 114, 115, 116 and early 123 should be an exact match. And those really cool dentist chair HR's can swap into later 123 cars with rounder bulbous HR's, so these too can fit into your car.

Plus you dont have to be so picky about the color. Vinyl interior spray color coat paint is available that works very well. Had great success with this stuff on 220Sb center console pad and for restoring discolored sunvisors.