I just ran out to the shed to look. I have a set I haven't installed yet for a bigger set of bags to use on trips. The one on the right with the longer part on the bottom is the same as what I have out in the shed. The one with the longer flange is the shorter post and goes in the forward sissybar mount hole the one on the left is the rear mount. Both match up to the ones I have and should be correct.

I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!