i have a 1981 honda cb400t hawk. but its got some bad rust holes in the gas tank. so much so its eaten all the way though. so im looking for a new one. i found one on line that looks like mine same model but its one year younger then my bike its a 1980? my question is would the tank off the 1980 model fit my 1981 model? an answer asap would be amazing! thanks 