This one:

http://www.pinballlife.com/index.php?p=product&id=572

viperrwk

The single drop target assembly was unique to Andromeda - it was not used in any other GP game. Only other single drops were used in the early cocktails but those are different.

Game Plan was not into spending money on new tooling or different parts and tried to keep using the same parts whenever possible from machine to machine and even standardizing parts - for example coil stops are the same for all coils, flippers included.

I don't have an Andromeda but from what I see, I think the tombstone might be too big for the hole in the playfield. The wedge may also be too thick to fit in the hole. IIRC the tombstone target is slightly wider than the standard drop so you can do some measuring when you get the chance and see how a standard drop would fit in the hole. Unless someone who has done this can chime in, I would take the path of ordering two extra drops, one standard and one tombstone, if you're going to get all new DE drops anyway.

viperrwk