Marcus, the ones you pictures look correct, except that they are missing the push-pin. Once the clip is inserted in the hole, you push the pin in until flush with the surface of the clip. This cinches the clip to the decklid very nicely. If you have the clips but are missing the pins, you can probably make those out of a nylon dowel or similar material. Deploy the lathe if needed, these should be very tight.
Jim, the picture you included is for the coupe/convertible, which uses a different clip design. The fastback is unique because the center clips are blind, there is no access from the back side.
The best picture I found is from the 1960-68 MPC (single year documents of this type were "parts & accessories catalogs", while the same class of documents that covered multiple years received the infamous "master" moniker as a prefix) was found on page 258 of the exterior moulding illustration section, drawing number P-5540 (attached).
This provides us with a part number, C7ZZ-6342527-A, and clearly shows the aforementioned push-pin. When I see a fastener that does not have a simple multiple-digit number (such as the 375890 shown next to this on the drawing which indicates a "standard" or "general" fastener), I consider it a fastener made for a very specific application where a standard fastener would not fit the bill. This obviously increases the cost but the designers and engineers gotta do what they gotta do in these cases. The C7Z prefix indicates that it was designed for the 1967 model year Mustang, and the 63 prefix on the 42527 basic part number provides an additional piece of information that it was designed for the fastback body style. It is my observation that most body related parts would carry the base (coupe in the case of the Mustang) number of 65, but when there is a part needed specifically for a different body style, the prefix would change. For example, all 67 Mustangs had the same fender and have a 65 basic part number prefix. For decklids, however, there is a 65 and 63 variation for obvious reasons.
Typically the fasteners would be included with the moulding in kit fashion. But since the part is identified in the illustration I took a look at the parts listing. These are listed in the text section, which means that someone could have ordered these fasteners separately. This fastener did carry over into the 1968 model year. It might have applicability elsewhere and at other times, but probably not in this case.
I snag these every chance I get. Even if I see a rusted out hulk of a decklid I can usually extract a few small nuggets of gold.
