Need mold help

Hi I am trying to replicate some over quarter fenders for the rear of my 94 rx7, I recently bought the rear over quarters a month ago and they just showed up, anyways these panels are 1100 shipped from japan and I need two sets and I only have one so I have to make a mold to make another set as I have two cars that need them. My question is what materials to use, how to flange this part for a mold?