Legendary 66 barracuda seats questions

Where do they go on the seat?
I have better photos on the camera. Measure twice , thrice...as often as ya need to get the covers centered.

D82A4B4C-965C-49C3-8C04-B5C226705EA9.jpeg

E223924D-E530-476D-A4AE-8B50B92AB371.jpeg

C1F1029E-09C4-406C-BA1D-EFC7A860A736.jpeg