I have the original paperwork from the OEM roof rack called "Wing Style Roof Rack"
The OEM roof rack INCLUDED the 4 Yakima towers:
Isuzu Part Number: 2-90116-900-0
I also was recently able to pick up 6 of the original Mighty Mounts from another forum member. I haven't used them yet. If I ever figure out a way to get a modified Thule fairing (like Workmesiter's), then I'll need 4 of the Mighty Mounts.