Marty, if you download the box1 picture and zoom in on the end of the strap you should be able to see what looks like 6 stitches in a fan pattern coming from the second hole. This is very similar to what I showed in the sketch earlier and attached again. I had showed only 3 stitches because the description of the smaller hole said it was 3 lobed. I think the second hole is 3 lobed because they forced leather stitches thru it with an awl or heavy leather needle.
The clip I showed in the sketch was the un-bent clip. The clip in the box1 picture could be 2-6-S-03b(the longer and bent one) attached on the outside of the strap with no fold over, or it is something very similar. Anyway the picture seems to indicate an attachment very similar to the sketch I did.
This box1 picture was from the Purdue files,the one where AE and FN are under the tail while the wheel is worked on, zoomed in on
edit: The clip may already be bent in this picture. The strap looks forced out by the bend of the clip
edit: The wider portion of the light colored feature, which would be about at where the pivot hole and screw should be, could be the washer I showed only the washer is a little wider than the clip and sticks out.