positive battery cable replaceable?

Sure can. If the battery end is in good shape asve it. Go to Wal Mart or the parts store and get a cable that you can add to the end of your present cable to make it long enough. The spliced pieces will be down by the starter and not as noticeable. Make sure you make a solid soldered splice covered with electrical tape or better yet shrink tube. Remember, any splice will cause resistance and could cause cranking problems. A single cable would be the best bet.