Different lengths are needed, I ended up with a throttle quadrant and my cables are 48" each, the mixture side could be a bit shorter however. A friend of mine with a vertical induction also ran into a problem with short cables and his are mounted below the panel. I would hold off on vans cables and measure them to get the right length.
-david
Also, this setup requires custom made brackets to hold the Throttle Cable on, Not hard to do theres lots of examples on the board i complied some here (LINK). I found the best way to measure cables was to use some ROMEX for house wiring since its nice and stiff and lay out where you want it to go and then take your measurement off it, or if you have cables currently put them in place from the panel and measure the difference, you need to have the brackets made first however.
Hope this helps.