OER Parts offers a wide selection of Battery Accessories for your 1987 GMC R2500. OER Parts offers 1987 GMC R2500 Battery Tender, 1987 GMC R2500 Battery Managment System, 1987 GMC R2500 Dual Battery System Controller Set, and 1987 GMC R2500 Battery Relocation Set. Battery Mat Battery Topper Battery Terminal Protectors Battery Post Cleaning Brush Battery Terminal Puller