the 92-99 Bonnevilles have factory door sills and have holes drilled in the Body so they can mount up...there are plastic tabs that secure the plastic to the body

and also because the GP door sill is not as wide and the stock one and will offer less protection than you would have with the stock one

Thanks for the Info Pat

not a problem, remember i already did custom door sills on my 93 almost 3 years ago....so i figure i might as well have it done on the 03 as well

can you post pic?