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Look like normal disc capacitors to me. Any that look similar to these would be fine http://www.rapidonline.com/electronic-components/suntan-ts15001h102ksbpa0r-1nf-10-50v-y5p-2-5mm-ceramic-disc-capacitor-08-0200.
you could try something like this http://www.rapidonline.com/Cables-Connectors/TruConnect-PCB-Jack-Socket-Stereo-3-5mm-20-0137?sourceRefKey=YyKBeYhU0&filterSearchScope=1 or you could just find an old pair of headphones and cut the wire off that. You should find 3 wires inside, one red, one green and one black. Red and green are right and left (not sure which way round) and black is common.
no, supply voltage range is 6 to 32v
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