Kitchen Clad on end panel

[Slloyd65]

I'm sorry if this sounds daft but we are new to this kitchen fitting malarkey.
We are replacing doors and work tops and have brought B&Q BROOKFIELD kitchen doors. We have also brought the clad on wall end panels to match but they have arrived and are much deeper than the unit! Will these need to be cut or have I brought the wrong thing? We have brought replacement end panels for the base but I liked the finish the clad on have the wall units. Also how do you fit them? I assumed you would have to attach from inside the unit!
Sorry lots of questions

 

[foxhole]

They sit flush with the front of the doors so need to be a little deeper, any excess being cut from the wall side. Secured from the inside as you mentioned.