OER Parts offers a wide selection of Battery Accessories for your 1973 GMC G25/G2500 Van. OER Parts offers 1973 GMC G25/G2500 Van Battery Tender, 1973 GMC G25/G2500 Van Battery Managment System, 1973 GMC G25/G2500 Van Dual Battery System Controller Set, and 1973 GMC G25/G2500 Van Battery Relocation Set. Battery Mat Battery Topper Battery Terminal Protectors Battery Post Cleaning Brush Battery Terminal Puller