Just in case it makes a difference in location - When and where was your car built?
Never mind (though its a good idea to include that info in every request here)- it appears to me that these were not installed on 69 Convertibles. All of the ones I have pictures of 20-30 cars from all factories used a fusible link rather than this block that was used in earlier years. This is similar to the one in the main loom where it attaches to the starter relay - though on that one it is installed to the end of the loom
Couple of examples below - hope this helps
Please ignore the comical application of decals from the decal "kit"