the following spare parts worked for me:
Photo-Transistor (OSRAM OPTO SFH320: Fototransistor, NPN, 450...1150nm, 120°, PLCC-2):
Link to Seller (reichelt.de)
LED (SLOAN SMD-SPLCC-02: SLO SMD-SPLCC-0 LED, SMD 3528, PLCC-2, weiß, 2200 mcd, 120°) :
Link to Seller (reichelt.de)
because it works with light-sensors, you don't have to calibrate the pedal, just use the right spare parts.