M-Squad told me they are working on reproducing several of the early bumper stickers which starting showing up on CHP cars in the mid/late-'80s but so far nothing has been forthcoming. Here's the "Dial 9-1-1" and "Buckle Up" messages both on an '86:
I need the "9-1-1" sticker for my car and if/when I find out they are available, I'll give a shoutout here.