Thanks for that info I have the original 250SE coupe radiator so would the tall grid 280 rad with oil cooler be the same overall size?, if it is did they increase the thickness of he core bank on the water side to compensate for the loss of surface area taken up by the oil cooler?

The difference in the position of the oil cooler now makes sense, the radiator I have seen on ebay which confused me with the oil cooler on the right must be for a 3.5 although this isnt stated, the seller has been selling other 3.5 stuff though