OER Parts offers a wide selection of Battery Accessories for your 1968 GMC C35/C3500 Pickup. OER Parts offers 1968 GMC C35/C3500 Pickup Battery Tender, 1968 GMC C35/C3500 Pickup Battery Managment System, 1968 GMC C35/C3500 Pickup Dual Battery System Controller Set, and 1968 GMC C35/C3500 Pickup Battery Relocation Set. Battery Mat Battery Topper Battery Terminal Protectors Battery Post Cleaning Brush Battery Terminal Puller