For those who are interested, I got the details for the exact sternum hardware I have during the surgeon follow-up call today. Kinda neat, and confirmed it was MRI safe:

THORECON RIGID FIXATION SYSTEM
http://aemedical.com/products/rigid-fixation/
MRI-compatible stainless steel

Had a good follow-up appointment. I’ve been cleared to drive. Still a little worried on long trips with my poor sleep.

I also can start cardiac rehab therapy soon. That will be good