I might email BetterBolts and see if any of their existing Transition shock bolts are that size (their product pages don’t always specify size, just what bike/product they fit). Oil slick Ti would be a nice replacement, but matching head shapes might be important too.
As for shock tuning, with the 1002’s kinematics you probably want to run the bladder as low as possible, 170-175PSI, and only adjust it up if you see a clear reason. That’s what I run on my GT Force and it’s a bit higher leverage/less progressive. I think I’ll probably run one positive spacer on my Force this year, two on the 1002, and no negative spacers on either because they just make the top harsher and don’t change the sag point much unless you’re very close to max PSI.