I went for the saddle pack tray conversion, you will need U3764 (the tray) & U3702 (the saddle pack posts) they have them at wheelspinmodels.
wheelspinmodels.co.uk/i/73829/
&
wheelspinmodels.co.uk/i/73826/
Here is the kit on mine
Great if you decide to run saddles. I imagine if you already have saddles they would be the way to go, that way if you sell the cougar you can use them in your existing car