Hello,
I took photos today and found there to be several more than the two you've found. I started at the blower fan, that's under the right front fender, then worked around the box pointing with my finger and taking photos of each bolt hole. The size of most of the nuts are 3/8" but I believe they may be one or two 7/16". The photos are posted on my photobucket site, go to:
http://s90.photobucket.com/albums/k257/2blu442/
Then click on the blue letters that say Olds AC 1968-72 for the subfolder with the pictures in it. Let me know if any of the photos are unclear. To work on this I unbolt the passenger side inner fender well and crawl in through there. I believe you'll need to do that to get the fasteners from around the fan motor, and it will make it easier to reach many of the other ones. John