Marco's has them

http://www.marcospecialties.com/pinball-parts/13A-11

They state they are for BIG GAME, CATACOMB, CHEETAH (Stern), FLIGHT 2000, METEOR,

No, there is a different style of lip for the target to sit on.  I have seen Bally targets 'converted' by putting a staple in them to replicate the Stern style lip - it does actually work!

I am pretty sure that all games up to and including Meteor had tombstones, so basically anything pre 1980.

Swinks, if you make them it will be very interesting to see how they perform, as the tombstone style have a reputation for dropping much better than the hooded targets.