WindyNation 2-0-Gauge 5/16 in. Pure Copper Tin Coated Cable Lugs with Heat Shrink (10-Pack) TC-2/0G-56-10PC-HS - The Home Depot
Amazon.com: 10pcs 8 Gauge 8 AWG x 3/8” Pure Copper Cable Lug Terminal Ring Connectors with Dual Wall Adhesive Lined Red + Black Heat Shrink Tubing – by WNI : Industrial & Scientific
Amazon.com: Ring Terminals OT Type Copper Open Connecting Nose Cable Connector Terminal Crimping Ring Cable Wire Terminal Connector (Color : 150A(8pcs)) : Industrial & Scientific