Quantity   Component name
4 × VESC Brushless Motor Controller. Suggest Maytech brand from ebay,
1 × Raspberry Pi Used for control.
1 × Several Bags of #8-16 x 3/4 Screws for Plastic https://www.amazon.com/gp/product/B00GDY0EMG/
1 × Several Bags of #6-19 x 3/4 Screws for Plastic https://www.amazon.com/gp/product/B00GDYECN8/
4 × 3/8" x 1.5" hex bolts with nuts Similar metric screws are fine.
16 × M4 x 14mm cap screws These hold the motors on. This kit works: https://www.amazon.com/gp/product/B01M3SSEG2/
4 × JST PH 4 pin plugs For CAN bus comms with the VESC. Suggest this pack: https://www.amazon.com/gp/product/B01JG1F0SA/
4 × Magnetic encoder boards You can either use AS5047 breakout boards from Digikey/Mouser (https://www.mouser.com/ProductDetail/ams/AS5047P-TS_EK_AB?qs=sGAEpiMZZMvc81WFyF5Eds5HfNOHCyjSQ7yI0JZudxs%3d), or fab a custom board from my github files (https://github.com/tlalexander/vesc_encoder).
1 × Set of parts printed from the OnShape files
4 × Turnigy Aerodrive SK3 - 6354-260KV Brushless Outrunner Motor https://hobbyking.com/en_us/turnigy-aerodrive-sk3-6354-260kv-brushless-outrunner-motor.html?___store=en_us
8 × 6817 Bearings Buy cheapest possible - can be had for $6 from aliexpress.
16 × 6808 Bearings 10 for $22 on Aliexpress
2 × 8mm x 8mm Aluminum spider coupler Half of a coupler is used to hold the motor on the shaft. Consider aliexpress or amazon. Look for the 20mm dia x 30mm long version, like this: https://www.amazon.com/uxcell-Spider-Coupling-Shaft-Coupler/dp/B016VQZ1LE/
2 × 6s 10Ah battery packs Rover V2's battery compartment is currently designed to fit two of these: https://hobbyking.com/en_us/multistar-high-capacity-6s-10000mah-multi-rotor-lipo-pack.html?___store=en_us
1 × CANable USB to CAN bus adapter For motor comms. http://canable.io/
4 × RC4WD Demolisher RC car tires Tires are sold as pairs. Order two pairs. https://store.rc4wd.com/KK2-Demolisher-Monster-Truck-40-Series-38-Tires_p_750.html
4 × Century Spring 10914 Compression Springs http://www.centuryspring.com/compression-spring-10914.html