【Note-1】 This Item Comes With An Auxiliary Tank And Has 2 Outlets. 【Note-2】 For 1979 GMC C1500/C2500/K2500 Without California Emissions. 【Note-3】 For 1978 GMC C15/C25/C35/K15/K25/K35 Without California Emissions. 【Note-4】 For 1975 GMC C15/C25 V8 5.7L Fit 1