You can easily find the Wide Body Brackets-Yakima # 8001.  Just call rack
places to see who has them in stock.  When you drill the holes use the mount
as a guide and masking tape marks for the hole locations because the drill
bit wants to wander on the fiberglass.  After messing up one hole I figured
that out.

You can also find new or used uprights and cross bars on Ebay as the high
tower rain gutter uprights fit a lot of vehicles.