They are used for the thin SS strip on the center of the dash and the end pieces also. the clip part # is B5A 7004878-A
I have the ones for the dash but not the ends. I used screws and nuts for the long trim on the dash but could not find any for the end trim pieces. They are more shallow than the long piece. If you can't find some I will send you my used ones.
Allout proposed this :www.clipsandfasteners.com/Door_Trim_Fastener_Ford_383033_S101_p/a11863.htm I shot them and e-mail but havent had an answer. Quality might be and issue.
The ones Rui stated are for door panels and are a different style for what you are looking for. The same company show these http://www.clipsandfasteners.com/Rear_Quarter_Strip_Trim_Fastener_Ford_Chrysler_p/a1256.htm I have never ordered from this company and the description does not say the size. Also I was in NAPA the other day looking for a different clip and noticed 3 different size clips similar to what you were looking for. Worth a shot.