Try our new info resource - "Aladdin's Cave" (Main menu)Just added a separate link to Ash's Dropbox thread (shortcut)
I have a spare number 4 carb body, 069a, and most of the internals for the rest of the carb bodies, I'm just waiting for Dom to see if he needs anything else besides the carb body, an emulsion tube and the jet leaf spring. Looking at the state of his carbs it's likely that he will.
Yeah it was emission related, California related almost certainly.You can ditch it all and just fit the 500 filter, keeps cleaner as well. Vent the pipe from the breather over to atmosphere. Either keep the old stuff or sell it on, your choice.