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#1. its an exhaust support/insulator
part# for s14 is 20535-s14001
part# for s13 is 20610-s13001
there are brackets that go along with it that have separate part numbers
#2. you get one the same place you get any oem part - a nissan dealership. go to courtesyparts.com and you can find your own parts / part numbers in the future. they have an online catalogue of parts, diagrams/pics included.
#3. it supports the exhaust. it does not support the transmission, nor would not having one cause your transmission to shake. you are either hearing the exhaust moving around or your transmission is not properly secured to the mounts/car. not having one is no problem. i've never had one on my car.
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