Rear wiper

This site rocks. Just found it and now it's bookmarked.
Anyway, I have a 1998 Jeep cherokee classic with 190,000 miles on it. My rear wiper blade has a sprayer nozzle on it, but I broke it. I cannot find another one online or anything dont really want to got to the junkyard. There has to be somewhere I can buy one online or something right. Also, my rear wiper arm that dispenses this washer fluid isnt dispensing it. Does the motor that moves the arm also pump the fluid? My arm still works and my front wipers still work and spray fluid so if I buy a new motor will it also start pumping fluid? Last question and I will donate to your cause buddies, my car jeep sometimes when parked on an incline wont start.I found that if I shove the gear shifter up past the park it will start. Shifter linkage? If this sounds right please tell me, also where is it?. Thanks guys. I will be eagerly awaiting yur reply.
Derek