I have a nighthawk front end on my cm400. the front turn signals and headlight was differant, but i got it worked out. i also have a cb650c 1980 model and i thought about switching front ends with the 400 so i could have twin discs on the front of the 650(probably what you are wanting). i also like the handle bar position of the nighthawk front end. anyway , just by looking at it , i believe it would be a no brainer, allthough i havent acually checked any measurments. basically everything looks the same exept the bars and twin discs.