Once again Merlin at St Charles Isuzu (800-727-8066) has been extremely helpful.

2004 Isuzu Rodeo, applies to similar model years.

Crossbars: $89.74 for crossbars.
They will not mount to anything, it's just the crossbars.
Nothing in the Isuzu catalog lists any attaching hardware.

Seperate accessory catalog
Isusu Crossbars: $90.01 for kit with two bars and the kit needed to mount them to the rails the run the length of the roof. (27 cents more) Mounting parts *not* available separately.
Model # 2-90005-100-0 193 in stock. Well, 192 after my order.

1. They called me. I didn't have to keep hounding them.
2. They're sending me a shipping label to send them back at St. Charles Isuzu's expense. Outstanding service.