There's a couple of pieces, a rubber insulator, and a paper insulator, that are not documented for steering column attachment. They are shown in the 75 Ford Car Parts (aka MPC) Illustration Section 35 pg 4 for 64-65 Mustangs as separate pieces, and shown attached for 67 on page 5. These are the horseshoe shaped column clamp, 3668, and the bracket at the lower edge of the dash for the column, 3676. The 64-65 and the 67 Chassis manuals also shows them as attached. The 60-68 and 75 MPC calls them "Assemblies", which implies the rubber and paper were supplied attached to their metal counterparts. These two pieces have a nasty habit of disintegrating and/or coming loose at the wrong times.
Attached are some sketches and pictures of these items. The rubber piece is documented for both 64-66 and 67, the paper piece is for 64-66 use, but is similar to the 67 requirement, the 67 piece is larger. (I didn't make a drawing because we reused the old paper piece.) The pictures show the differences. The originals are dated July 1995.
Jim