Regarding the door bottom seals, the problem is the material that is being supplied today. It is less compressible than original. But, if you are undertaking a complete restoration, or you expect to replace your sills, you can do like we did and account for the thickness final compressed thickness of the door bottom seal. This way, the seals will be in place like original and I must admit they look very nice. Another method is to relocate the holes which retain the seal clips. If you have welding repairs to make on your doors this is very easy.
If ST didn't think they were necessary, they wouldn't have included them.
T