I know this is an older post, but hoping for a response. The instructions in my manual mentions a double insulator on the driver side. The picture from my driver side shows no lower insulator but only one upper insulator. Do you normally stack two insulators, one on top of the other for the driver's side? My truck has always had a sag on the front left side and I'm thinking this is the reason. Sorry for the poor image, but it was tough to even get this one. Thanks for any help you can provide. BTW it's a 1955 C3B.