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Yes, I just used 1/8" rubber bands. dont know what size since i just had a bag of misc rubber bands. Look at the remixes, another user made belts for this engine. As for the electrical parts, the compressor housing that is with this thing houses two AAA batteries and a switch. If you want more torque to power the motor, transmission and transfer case then go with the 12v motor option. you can find the compressor housing under my things. You will have to wire that up on your own though. I just have a 12v barrel jack that i plug an adapter into.