you will laugh
you guys will laugh at me, and call me a hack, but heres what I did for an overflow bottle for my transmission on the vent hose.
I used a peanut butter jar (clear plastic) cut a hole in the lid and screwed in a brass fitting, hooked my line to this, then I drilled a hole in the side of the jar (it's mounted horizontall w/ zip ties in the frame rail) this hole alows the tranny to breathe, while alowing it to burp fluid w/out spilling any on the track. I've ran this all last summer and havent had any problems, you really cant see it unless you look under the car in the drivers side frame rail. I'll post some pics in a day or 2...