I am currently rebuilding a 1200xl (power valve) engine and carbs for a guy.

Today I started the carb rebuild and noticed that the carb fitted with the acc pump had a gold spring fitted and the other 2 have silver springs.

My question is what is the stock combination of needle/seat and spring. Also what should the pop-off be stock?
All 3 carbs are fitted with 1.2 N+S.