Here is all that hold your entire e30 together...

[KangamangusDriver]

I have two nuts in my pants

With all seriousness it is so valuable to have spare metric bolts and nuts laying around.
nothing like 3am and you are missing a stupid nut to complete a major project that you have been working on for weeks.

[Jscotty]

Go to the next step - a shade tree mechanic can do work just like a "big buck, big name restorer". Take them to your local plater & have them re-zinked/cad plated. A 50# bucket of bolts is @ $25. Nothing like a cleaned up, repainted part going on with bright shiny nuts & bolts!

That is an excellent idea. In times past I have usually gone with replacement bolts or I ended up painting the old tarnished bolts. When I was a kid, I sandblasted and repainted my bicycle with blue metal flake paint and applied flame decals and clearcoated it. By the time I got all of the old parts back on the bike, (bearing caps, bolts, brackets, etc) it was a major dissapointment that the bike didn't look much better.