The L1 with model number ending in 1 on case has a YELLOW screw, as fitted to 3 door cossie.
The L6 with model number ending in 6, has a white screw, that looks more like silver/grey after a few years, the L1 yellow screw is a very definite yellow.
Definitive way is read the model number on ecu case, assuming no ones changed the pcb!!
tabetha