The red-marked port needs to stay open to the atmosphere. All it does is draw air from inside the cab as the vacuum powers the flapper inside the wiper motor. You definitely DO NOT need the hollow bolt or the hard line to the pump.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!