Dave, you're car is not a rebadged Sentra. They share powertrain components, but other then that, the chasis is completley diffrent. Diffrent length, width and weight. Engine components from a Sr20De will fit your car, but even that depends on roller rocker/non-roller rocker model. But, if you've been informed your car is a re-badged Sentra, you've been misinformed. it's a totally diffrent car...
for suspension components, search for a G20 only, to ensure propper spring rates for your cars weight.