If you order from Bellacorse he's got the lengths already made out for the America, brakes and cables. Just remember to talk to him about the brake lines because you will need an extra one for the front.
To get a chrome speedo cable you've got to send the original to Barnett. I had mine done last winter and their turn around is fast. They have to take the end closest to the front wheel off and put it onto the new cable. Also be sure to snug it back up tight, mine came loose on the ride down to Georgia this year. Their inside cable is brass and the end snapped off when the cable came loose. It wasn't a big deal since I just pulled out the broken one and replaced it with the original.