1994 Ford Explorer XL 4wd - "plastic thrust spacer" & "cam assembly" in hub: how check condition and alternate names?

Engine:

- Type: 4.0-liter V6

- Horsepower: 160 hp at 4,300 rpm

- Torque: 235 lb-ft at 3,200 rpm

Transmission:

- Type: 4-speed automatic

4WD System:

- Type: Part-time, shift-on-the-fly

Suspension:

- Front: Independent, coil springs, and anti-roll bar

- Rear: Solid axle, leaf springs, and anti-roll bar

Brakes:

- Front: Power-assisted disc

- Rear: Power-assisted drum

Fuel Economy (EPA Estimates):

- City: 16 mpg

- Highway: 20 mpg

Cargo Capacity:

- Behind First Row: 99.7 cubic feet

- Behind Second Row: 45.5 cubic feet

- Behind Third Row: 0 cubic feet

Seating Capacity:

- Standard: 5-passenger

- Optional: 7-passenger

Notable Features:

- Optional V8 engine (210 hp, 275 lb-ft)

- Available third-row seat

- Optional leather upholstery

- Power locks, windows, and mirrors

- Cruise control

- CD player