Old Texaco Gas Station

Copy the files from the folder: "Old Texaco Gas Station files" 
in x64t.rpf\levels\gta5\_hills\country_04\cs4_05.rpf\

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Old Texaco Gas Pump:

copy the files from the folder: "Old Texaco gas pump files"
in x64h.rpf\levels\gta5\props\roadside\v_utility.rpf\