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They are grade 8 bolts, and Rodj is correct about the heads.
Seemed like I bought a special offset 17mm wrench for something in there. It was about 10 years ago, but I still have the wrench, it is something I use on rare occasion.
Just for grins, if you didn't change your U joints before, now is a really good time to do it.
Use the correct torx bit and 1/2 inch socket set with a large breaker bar, just go for it put plenty of pressure so the torx bit doesn't slip.
I ended up having to use a piece of pipe over the breaker bar, for extra leverage when i did mine. I recommend you keep heat well away from the bearings and aluminum you wont need it, good quality torx heads and bolts can handle the torque.
Do yourself a BIG favor and just take the half-shafts out....it makes accessing the hubs 1000% easier, AND you can clean and regrease the u-joint if you do not feel that its time to replace. IMO anytime you have a u-joint on the table its time to replace them...$25 ea is too cheap to avoid going back under the car again this year. or next or the year after that...
You can also replace the torx bolts with allen heads or hex, whatever your preference. I like the allens. As long as they are grade-8 or better, you;re good to go. See if there is a Fastenal store in the area. Thats the worlds best nut & bolt store.
all ready done and just trying to get drivable for now.........your right though about doing both hubs and half shaft u-joints at the same time.
have to do a full bushing kit next spring and plan on u-joints,break pads, and shocks at that time
wouldn't have done hubs now, but the drivers side had 3/8" i play form side to side at the ends of the tire. the pass side was a different brand and looked to have been changed not to long ago. have new in both sides now, SKF manufactured in usa. they look much better quality than the ones that were in there