The tower is from a little earlier than you suggest, assuming it's a 6-12768 catalog number. Those were around 1991 & 1993, if I recall correctly.
It's found in Lionel Service supplement #18 (link). Looks like the smoke unit is 610-2722-050.
I could not get the part to come up on Lionel's parts site. It is of the vintage that might have been included in a sell-off of the parts inventory to a third party. But maybe the number could help you with various parts dealers.
As Überstationmeister mentions, there is a decent chance it's a Seuthe unit.
-Dave
