Original Challenger Chin Spoiler H/W Details?

[Floyd]

I did some googling and couldn't find any pics of the original hardware used to mount the chin spoilers on a Challenger.  I've seen the factory drawings and have pics of what was used on Troy's Bronze T/A (which appears to match the factory drawings).  Looking for fastener sizes, plating, etc.  I know they were dealer installed, so maybe there is a lot of variation? 

I have an early edition of Dave Wise' Fastener Guide and there's no examples there.

Any help?  Thanks!

Link to drawing:  http://www.e-bodies.org/Resources/Engineering_Illustrations/TA_AAR_Front_Spoiler.pdf

Pic from Troy's T/A below.

[Brads70]

Were they always "factory" installed? I thought I remember reading sometimes they were dealer installed. If that's true then pretty tough to narrow down a " correct" fastener?

[Floyd]

Factory drawing provided for dealer installation as far as I know.  Just wondering if the kit provided in the trunk included hardware.  Otherwise, as you suggest, the dealer could have used anything.