Roof rack clip question

I recently bought a used OEM Yakima roof rack, but it appears to be missing the mounting clips that are used to hold the rack onto the stock rails. Has anyone found a source for these? Were they supposed to be included in the rack when purchased (I looked on the installation instructions pdf and they show up as one of the part numbers). Can I use an Isuzu Yakima Q clip in its place? I have the rack but now it is just sitting on my rails! Help!!
http://www.vehicross.info/gallery/da...m/DSC00700.JPG

This is from the service part insert that came w/ the entire roof rack kit...

"Service Part # 2-90116-903-0
Description Tower Clips w/ Screws"

Check here $21.78
Tower Clip

Here's a pic of the clip you seem to be missing if it helps.
http://www.vehicross.info/gallery/da...mbs/clip_2.jpg