I broke 2 of these bolts removing the vacuum hubs on my 2001. Oddly enough, the local "parts" store had the right thread and length bolt in stock, (had to take one in to compare, as Axe recommended) only without the 10mm flange head (they were 12mm regular). Long story short, a thin wall 12 point socket fit, the bolts were all of $2.37, and the hubs haven't fallen off yet. I also bathed the length of the bolts in never-seize so hopefully I'll never have to go through that again.
I like to think a lack of new parts is an invitation to improvise.

If I had a hammer.....