Buy proper ones from Porsche. Only £150 a side direct replacement. These don't give you all of the lower lip that you need.It is usually the bottom that rots first and you only see it when it starts to run up the side.I would agree with 944 man that they are just a botch job. If you are going to go to the effort of replacinbg you sills then do it right.By the time you pay some one to fit weld and paint them the difgference in the overal job would be very small indeed.If you want to see how to repair sills look at my posts "what lies beneth" or at peter's blog on line and that will show you what is involved.By the way where do you live as Alisdiar will fit them for you or i would do it as well but only if you are able to come up to Scotland.