The lowers don't go bad often. Danny or myself probably have a few good used sets. I think you can get them made custom from Motion Pro but it's not going to be a stocking item.
Barnett makes cables for the Vmax but they don't advertise them. I have a pair they made for me (SS braided/ grip to junction box) and can make whatever length you want if you provide the dimensions. If you tell them you need them for a Vmax/ year they can make them. I would guess you could have them make a set to go from grip to carbs too, if you wanted to eliminate the junction box. http://www.barnettclutches.com/cables.html
I think I would just go with some used stockers myself if I needed the lower set of cables. The Barnett cables are not inexpensive, but they look nice and are well built.