i think i saw the words custom and ultimate, bout 1000 dollars a piece.
to the OP.
if your lifted too high your cv's will "rumble" a little. And if you bastardize a couple, their pretty cheap at napa in the US. drop it down a bit and try again. I think the magic number is>23.25 inches fender wheel center distance. This could also be expressed as greater then 4 inches of lift.
In all likelihood, you won't surpass the height of top plate, 927, 3 clevis combo for the front with the jba 4 inch (about the same height +- .25") and custom anything won't be needed.
But its your money.
i'm running just a top plate on 927 and i'm at the same height as the last JBA4 that posted heights on here. Still running factory CVs a year later.