They attach between the HE and the bottom of the case. 1 on each side. I found the drivers side on eBay, but I am not sure what the other side looks like on a 75-76. Price seems high and I prefer to get a set.
Correct me if I am wrong, but this is the driver's side for the late vehicle....
Click to view attachment
I have two other pieces that look nothing like this and I can't figure out how they attach, so I am going to say that they are for 74 and earlier. Don't really need them.