The part number for the specified capacitor is 1210J1K00560KAT. This is a CAP CER 56PF 1KV C0G/NP0 1210 model ceramic capacitor with a capacitance of 56 pF, ±10% tolerance and a working voltage of 1000V (1kV). The capacitor is manufactured using the C0G/NP0 dielectric material and is available in a 1210 package size, which corresponds to a 3225 metric package.