Jeff..Try contacting Jim Osborn Reproductions.
I know they make a 1971-73 Chevelle Canadian posi decal,but their website isn't showing a picture.
Here's The Skinny
BTW-Jim Osborn is ALWAYS looking for authentic,unique & scarce labels and decals for our vehicles.If you have a good original one,they would like to reproduce & return it to you with a bunch of repros free on them.