These are the cool 75-78 LHD bench seats. The driver seat could be converted from LHD to RHD ok-ish (swapping the hinges between the driver and passenger seat) but the bench would need cutting and welding of the seat frame to be installed in a RHD vehicle!
If looking for RHD specific parts in Europe I know a Belgian that imports vehicles for parts from Australia and so has RHD specific parts in stock as they generally have less interest here. But if it's for the US that is going to be a bit far away...