Need advice - 1983 Kawasaki KZ550 - gas in airbox

1983 Kawasaki Spectre KZ550 - TK Carbs. I have had it up and running for a few days and have noticed a small amount (5-10 drops) of gas leaking from two holes in the bottom of the left side of the airbox in the morning. Also results in gas smell in the garage. I have looked at a few new and used airboxes for this bike on ebay and they have screws in the two holes in the airbox. My guess is that one or more of the floats in the carbs are not completely stopping the flow of gas from the 4 carbs and that one or more is overflowing gas slowly into the airbox overnight and leaking out the two holes on the left side as the bike in tilted left when using the kickstand. Has anyone else had this problem or could someone identify the exact part on the attached photo from the Kawasaki Service Manual of the carburetor parts to look at to stop the leak - thanks in advance for your reply