Parts breakdown of the radiator and mounting.

A lot of online Toyota part sites only show this:

I found this:


Here are the part numbers.
The 8 bolts that hold the individual rad mounts to the radiator itself: 90068-04035
Replacements are M5-0.8, 10mm length (I ordered mine from a hardware store in stainless).
The 4 bolts that hold the fans to the mounts: 91621-B0616
Replacements are M6-1.0, you will want 20 or 22mm length.
Then the screws that hold the condenser to the radiator: 90068-04036
I would suggest using a bolt rather than the original Phillips screw that strips easily.
It's M5-0.8, I would suggest a 22mm length, or if only a 25 is available, using a couple washers, you don't want the bolt extending past the nut welded on the mount.
The rubber insulators for the top side of the radiator 16523-23010
For the bottom mounts: 90480-40016
The mounts themselves, upper: 16505-21010
Lower: 16506-21020

 

There seems to be two parts store versions, one for the consumer that doesn't show as many parts, and ones for techs that do.

 

Here are pics of the clip nuts for mounting the radiator to the radiator mounts.
Part# 1649320310 Washer - Plate Radiator



Here they are installed. Note: you have to bend them a little inwards to get them to stay.



I noticed watching a video of a radiator being replaced, the clips look different. They almost look like the ones for tapping screws, and they used screws instead of bolts (which isn't a good idea in my opinion).

 

Here is the site I used: 2003 - 2009 Toyota PRIUS NHW20 OEM Parts | U.S.A. sales region, , 917612
A site a regular consumer might use: Select Parts Category - 2008 Toyota Prius | Toyota Parts Center