Just starting this thread to get it out there, but I am in the process of turning a SPICA pedal into a Carburettor pedal. The pedals are the exact same with the exception of the arm at the end which usually holds the cable. For starters, here's reference pictures of both pedals so you can get an idea of the differences. The carb pedal has a shorter arm, mounted maybe about 160* to the other arm. I was able to guesstimate based on these pictures the measurements to create a pattern out of cardstock and cut out a piece of metal from [if my memory serves correct] 2mil steel plate. After I cut it out I drilled the holes out. My car is currently away at a place where I have access to a lift, but I can only get to the car on Mondays and Tuesdays (soon to be hopefully Wednesdays as well) so it will be a while before I can get pictures of what I did and what I've done so far. So here's pictures of a pedal on eBay I found a while ago (these were used mostly for scaling the new arm), and an exploded view I just found so one can see the difference in the arm. I was unable to find pictures of a SPICA pedal, but the difference should hopefully be quite apparent.