The Yakima FatCat Evo will fit both Rhino Delta and KammBars. It is available in two sizes; the FatCat 4 will take 2 boards and the FatCat 6 will take up to four boards (or a combination of boards and skis):
Yakima FatCat 4 EVO black - ski and board carrier no. 8003075
Yakima FatCat 6 EVO black - ski and board carrier no. 8003076
Yakima FatCat 6 EVO silver - ski and board carrier no. 8003086
You can position the FatCat Evo 6 further towards the edge of the bar, so that may work better for easier loading of the skis on taller vehicles.