Well, these aren't rusty... just seem like they are slightly under spec. And they are hard as hell... when the socket slipped, it did nothing to the bolt. Luckily.
Had it stripped out or if it breaks, I guess I'll be getting the MIG out and making myself a new bolt head in a custom size.
I never had a lot of luck with the bolt extractors. I do have some "disposable" sockets and wrenches, so I always have the option Mike mentions... In fact, I was REAL tempted to make the 3/8 fit... but I try to only do that stuff if I can replace the hardware... I don't think I have the option here... these are pretty oddball bolts.
It turns out I did have a 6pt 10mm 3/8 drive socket in the extra toolset... but since the bolts are so tight, I decided I really want to use the vibrating power of the impact to help extract these... so I ended up going to Harbor Freight for a set of 3/8 drive impact sockets... just so I could have the 10mm. I'm pretty sure these are thin enough to fit in the access hole.
I fear if I just use a standard socket, I'm going to snap the bolt(*) off.
Looks like the fun is scheduled for a beautiful Sunday. At least my new rotors made amazing time getting here.