Trophy shop
We went through this little snag as well. The solution we came up with was make a cover that went over the leavers with slots just big enough to let it fit over the leavers. Then we got a trophy shop to make a black and a red plastic strip with (close--THROTTLE---open) on the black strip and
(lean----MIXTURE----rich) on the red strip. We then just put the two strips on either side of the leavers, double taped to the cove we had made. Looks good and works well with the other labeling. The trophy shops have two different thickness plastic plate to make placards from one about 3/16" thick and a thinner is 1/16" or so. I like the thinner stuff, both come in a number of colors. We have a thick red one with our N-number at the top center of the instrument panel and a small blue thin one over the "CWS" button also on the panel. There are a number of ways you can do this detail, it is what you wish to make of it. Just what we did at the time. Yours, R.E.A. #80888