I've got a 66' GMC with some after-market "cheap" mirrors and want to install the
factory type, looks like a triangular type base with three mounting holes. The kits come with mounting screws but I am assuming the screws do not just attach the base to the outer door panel only and was thinking there must be some type of fastening bracket need on the inner part of the panel for the screws to tighten to. Am I thinking correctly and is there an aftermarket bracket for a 66'? Haven't purchased any yet but looking to see what is needed to do it correctly and with a solid point of attachment. Thanks.
