Doesn't look good

 is a shard in.

Location
Found during the Cyberpsycho Sighting: Discount Doc quest on the attacker.

Transcript
I gotta say, that Mary of yours sure has a head on her shoulders. She got you here at the last possible moment. Your body's rejecting the implants, and no wonder - it's not ready for them. They're military-grade, you can't use them without the proper training. Christ, they're not for civilian use at all. I can give you a script for painkillers, but don't forget - the pain is your body's way of warning you. If you ignore it and keep using that chrome, you could cause permanent damage to your spine. You might be able to take off that exoskeleton now, but if you break your spine you'll never move on your own again.