Turbine --> CHRA bolts: heat treated?
 

I need some bolts that hold the turbine to the chra that are about 1/2" longer than stock. Are these bolts made of any kind of special material, or are they "heat treated" in any special way (they definitely look different compared to a grade 8 or S/S). How do I identify them to a vendor?

Also, if anyone knows of a source (vendor) that carries them, please advise.

Thanks,
Steve C.
- TT 10ae under construction