I was wondering what parts will interchange or work on a '79 XL75? This bike is more of an XR now with none of it's street gear remaining. I'm looking to possibly upgrade it a bit using factory and/or aftermarket parts. Suspension, bodywork, etc. So, will parts from later XR80's or XR100's work? If so, what years? Also, I might put a headlight back on it. Can I change it over from 6v to 12v easily or am I just kind of stuck with that. BTW, the bike is setup to run now without the original battery setup. Thanks for any insight you can share!