I keep saying i want to do this. And technically, you don't really need adapters at all, if you make the inner 2 lanes Tyco and the outer 2 LL. I can't remember if I have 2 or 4 LL 12-inch bank sections... hmmm. sounds like another dungeon dive, see what all is in them boxes...You can only get the adapters from Lifelike, so it's Tyco==>Lifelike==>Tomy.
You can get away with only Tyco and Lifelike as Tyco has 9" banks and Lifelike has 12" banks. Lifelike also had 9" banked curves, but they were a set only piece and almost impossible to find.