I have a 2003 GMC Yukon XL 5.3L. Is my motor based off the LS1 or LS2 Design. I was told it was the LS1 design. The reason is I am looking at the MSD coils and they have 2 Diffrent designs. The first pic is for the LS1 motor and the second pic is for the LS2 motor. The one for the LS2 motor fits my vehicle. So is my engine a LS2 design or what?