Here are the relevant part numbers from the 230SL spare parts list.
The RHD pedal is: 110 300 00 02; it is apparently still available from Daimler at EUR 261,80.
Question remains whether you still have the RHD pedal lever (p/n 113 300 01 04) and the RHD support under the pedal (p/n 113 610 03 53) in your car.
Well, i guess one step at a time.