Hi Johnny,
Not sure what MIG-21 books you have, but the first one on this list is pretty new, I had it on preorder for a long time.
http://www.amazon.com/s/ref=nb_ss_gw...0&Go.y=0&Go=Go
It has some pictures I think of what you are looking for (2 ejection warning markings on the same side of the canopy sill) but they are very small and grainy. Still some good detail pictures though.
Maybe that helps, good luck in any case,