Fits all 105/115 cars. This is a replacement for the original return spring that mounts on the firewall and connects to lever on the back side of the gas pedal. We have seen a number of Alfas running without this spring and replacing it with something mounted at the Weber carbs.   We understand the need for a light spring to make a positive return on the carb throttle shafts. We also understand the preference for lighter pressure mashing down the loud pedal.   However, we highly recommend that racers keep the original in place in addition to the light carb spring.   When the carb spring dies or comes undone, the throttles stay wide open. A full throttle incident at the end of a straight is not a pretty thing.