Hans, those burners look exactly like the burners on our 1960/1961 O'Keefe & Merrit 42" cooktop--complete with griddle in the middle and burner with the brain. It could have been 38" or so inches. When my parents replaced the cooktop in the late 1980s, the replacement offered same layout and features, but my dad ended up having to make a 2-4" wide wood "filler" to fill up the original cutout in the countertop. I called it a built-in spoon rest lol.