There are many options open to you here and the C5 24volt conversion is one of them, this was designed as a package and was built to allow you to restore the C5 to original. If you are a dab hand with electronics and you know what you are doing, you can buy a simple off the shelf controller and twist grip, but be prepared to effectively re-wire the C5 in the process and an added bonus is the control pod wont work. If however you ebay the pod and motor contoller you will have enough funds to convert your C5 to 24volts