Cool. Yeah, I hear you on the difficulties of using the normal search engines. I think you're getting to the right strategy though. I usually just search a variety of common items, such as doors, suspension parts, etc to get an idea of who might have other Leaf parts. Trying different items is good as various cars may have different parts damaged or just not entered into inventory.
One tip I did find on the car-part database is there is an entry called "Hybrid Converter/Inverter" that seems to get used as a catchall for many EV components. For example when you search this on a 2011 Leaf, it gives the following options:
charger (behind rear seat), from 4/11 thru 6/11
charger (behind rear seat), from 7/11
charger (behind rear seat), thru 3/11
charging port (above front bumper), SL, 1 port (w/o quick charge option); cold climate package, from 5/11
charging port (above front bumper), SL, 1 port (w/o quick charge option); cold climate package, thru 4/11
charging port (above front bumper), SL, 1 port (w/o quick charge option); w/o cold climate package; from 5/11
charging port (above front bumper), SL, 1 port (w/o quick charge option); w/o cold climate package; thru 4/11
charging port (above front bumper), SL, 2 port (quick charge option), cold climate package, from 5/11
charging port (above front bumper), SL, 2 port (quick charge option), cold climate package, thru 4/11
charging port (above front bumper), SL, 2 port (quick charge option), w/o cold climate package; from 5/11
charging port (above front bumper), SL, 2 port (quick charge option), w/o cold climate package; thru 4/11
charging port (above front bumper), SV, cold climate package, from 5/11
charging port (above front bumper), SV, cold climate package, thru 4/11
charging port (above front bumper), SV, w/o cold climate package; from 5/11
charging port (above front bumper), SV, w/o cold climate package; thru 4/11
charging cable (120V portable type)
inverter (engine compartment)
junction box (DC to DC), quick charge option
junction box (DC to DC), w/o quick charge option
Other items that turn up EV related parts: battery, computer box engine, computer box not engine, electrical part misc and wiring, engine, power inverter (hybrid), transmission computer, wiring harness/misc. electronics.
Good luck,
Rob