You have a few options. If you want to retain the tiico air-box you can
use a K&N air filter. Don't know the pn# off the top of my head though.
It will fit right onto the tiico-supplied flange.

Or you can change the air box to a standard one.  An air-box/filter
assembly plus all of the hoses from a 1987-1993 **6 cylinder** dodge
caravan/plymouth caravan will fit & work well behind the tail-light!
(The air box from the 4-cylinder engine won't fit).

Dave, i attached a photo for you. If others want the photo pmail me.
-matthew