I was wondering if anyone could give me some advise on adding radii to this spotbar and if I'm doing it in the correct order.

The big problem is onc I add the corner rads and I select the back face edge it sellects the whole profile or part of the profile,

is there anway to select just the one edge? I have tried numerous approaches, variable fillets, and adding a R2 around the profile

and then trying to change the vertical face to R 1.2 but i sellects one off the corners to change as well as the vertical edge.

I have attached a model taken from an iges file (I have added the two first radii), and a pdf of the radius required.