My thoughts were the a/c was removed. The US spec Pagodas did not come to US with a/c fitted from MB. They were fitted at US dealerships. Check your engine compartment rear bulkhead for holes on the passenger side. This would be where the hoses would pass thru the bulkhead to the a/c unit. As for the pulleys, they were added when the a/c were installed, and possibly the radiator shroud too. Also when removing a/c most would not change pulleys back to stock pulleys. Note reasons for removing a/c s was because the a/c refrigerants in use in 1970s were ban and newer refrigerants replaced them and were not compatible with older a/c s, so people oust stopped using them. However those older a/c s can be upgraded to Handel the new refrigerants.