I think this is the post you originally asked about: viewtopic.php?f=3&t=6953&hilit=bolt+list
Some of that is still correct, but some has changed as well.
It was mentioned that Kcnc make a bolt kit, but that's not correct, they make some pulley wheel bolts, and some bottle cage bolts that can be used for mounting front derailleurs, but other than that they don't make any others.
Tiso makes some kits, but they aren't complete. The derailleur kits for example don't include barrel adjusters or limit screws or any of the front derailleur parts.
XX makes some kits too, they are pretty complete (the best kits we've seen up until now). However they use bolts from different sources so the ano isn't always consistent. They are also pretty expensive.
It was also mentioned that most derailleurs are using the lightest bolts already. Again not necessarily the case. With the FnN samples that arrived we did some comparing and found the following changes.
7900, Savings 18grams.
105, Savings 24grams.
Campag10, Savings, 17 grams
CampagSR11, Savings, 14grams
Sram Red, Savings, 6 grams.
Sram Force, Savings 16 grams.
You could go lighter by mixing in the Schmolke bolts, but honestly they aren't very good in most places. On a derailleur about the only place I'd consider them is the pinch bolt and limit screws. (Note, they are quite good as bottle cage bolts and topcap bolts though.)
You can also get more savings by changing pulley wheels.