Starting to look at the ads in catalogs more closely. For example: Correct stamped shields for various Chevorlet cars with BB engines. Meaning correct for some; but not all chevorlet BB cars. From GU. Looking for the right spark plug shield for a 66 chevelle BB. Noticed some from Paragon for 65 & 66 with 396 engine, would they be correct? Or the ones from GU, Year one, etc.