These are the 3x8x12.5mm Pivot Balls for the Arrma Kraton 4WD BLX, and Typhon 4WD BLX.
Kyosho Heavy Metal Caterpillar, Heavy Metal Tracks for the Kyosho Blizzard SR.
$129.99
Machined Aluminum Side Protection Nerf Bars, Blue: X-Maxx (INTC26834BLUE)
Output gears, differential, hardened steel (2)