2005 Avalanche 1500 (submodel: Base, LS, LT, Z66, Z71) Eng Oil Clg(KC4), 1st Design, With 7.75Mm From End Of Pipe To Start Of Flare Use 1st Design, For 2nd Des See 15809049. 2005 Suburban 1500 (submodel: LS, LT, Z71) Eng Oil Clg(KC4), 1st Design, With 7.75Mm From End Of Pipe To Start Of Flare Use 1st Design, For 2nd Des See 15809049.