Yes, I am very familiar with the left hand safetys for 1911's, and most automatic shotguns, but it seems that I did see a lefthand model 70 safety on a right handed boltaction, somewhere.
I don't really like lefthand boltactions, but sure do appreciate a safety that works good for a lefty. I can get by with the right hand version, on the Model 70, but it's just not nearly has handy.