The Invader doesn't come in trem-spaced because it doesn't need to be.
I haven't taken apart an Invader, but I know that a Detonator is already trem spaced, so I would assume the same is true with an Invader.
TB-11 would be a trem spaced Custom Custom, quite a different beast to the Invader...
Although the Detonator is trem-spaced, the Invader isn't. (I've got both here. The Detonator is physically wider and the pole pieces are farther apart.)
God that Invader is so ugly haha. I hate those poles but they are huge and even if they dont totally cover the E strings it probably wouldn't make much of a difference in tone. I think it's more of a cosmetic thing. I've run regular and trem spaced pickups in my guitars with Floyds. It really just cosmetic IMO. If you are worried about performance then I wouldn't if I were you but if its a purely cosmetic thing then I feel you because if I'm buying a pickup to use in a guitar that has a Floyd I get the trem spacing. It's like a "why wouldn't you?" type of thing. You could call the cutom shop and ask for an Invader with trem spacing. I doubt it would be much more expensive than the production model.
These guys list it as the trem invader http://www.piens.be/product/jackson/wr-1-snakeskin/nl/26087
Somewhere else they were refering it as the TB-11?!
I'm pretty sure the Invader doesn't need to be trembucker spaced.
Especially for playing pop-punk.