As GK stated, very little to nothing...
Most of the detail parts are out of production pieces, or never found items...
Some of the pieces can still be sourced from the manufacture or an authorized distributor like the Clippard valves, but other then that for most of the other detail pieces you are going to one either make them from scratch, two find a resin or metal replica, or three kit bash something you feel is close enough...
The good thing is that there are many fine replica parts being made now, so finding them isn't real hard...