Looks like I need to correct the bolt size for the Horn Relay Junction Block for the 65 GS. 3/8" diameter sounded too large to me, so after arriving home today, I took one from my red Steve Shuman car. It is a hex washer head, 1/4 - 14 self tapping screw and length is 3/4". This correlates well with the ones from my 65 Skylark parts car which are the same, except only 1/2" long. That horn relay is mounted on a thin steel plate instead of the thick bakelite mounting plate on the one for our GS's so the length differential makes sense
Adding them to the order I'm putting together for AMK.
Chuck