This morning, I went to change the front pads on my D2. This was the first time that I was doing it myself on this car (dealer did it all other times, yes I have changed brakes before myself). I went to take off the top caliper bolt on the driver's side and the head of it snapped right off! So I managed to take the bottom one off and I got a few replacements at the hardware store for 70 cents each. And it ended up working the same, but the head size is a 13mm instead of the old 12mm. Anyway, if anyone else snaps a caliper bolt, the size is: 8mmx20mm Fine thread.
I hope this doesn't happen to anyone else but if it does, you can buy that size bolt. It doesn't look exactly the same, but it fits and does its job like the old one.
Pictures coming soon.

 

Some pictures:

 

Aren't brake caliper bolts typically made from high-tensile steel? You might want to check on that before your replacement shears off.

 

yes I believe they are

 

I'm guessing he's giving this as a quick-fix option, as nobody should use a standard fastener in somewhere as important as a brake caliper.

 

Yes, yes you all are correct. This is only a quick fix if you need the truck immediately. My new bolt is coming tomorrow, so I am not worried about using a regular galvanized steel bolt for a few days.
Sorry, I should have made this more clear in the first place.

Edit: I got these "real" caliper bolts from Amazon. I didn't need the pins, but this was the fastest way to get them:

 

What if you use a High Strength Stainless Steel Metric Screw?
Here is where I get all my stuff for my projects. Look for Thread size M8 Length 20mm
McMaster-Carr

 

You could probably also get bolts in an appropriate size and material from any branch of Fastenal.