w124 side skirts, rocker panel interchange?

[87tdwagen]

Hi all,
Looking to paint the 300td and I'm toying with some visual changes. One of which is possibly adding lower rocker cladding from a later series car.

Do the later sill covers work on an early car? Are the mounting points available in the earlier chassis? Im not interested in doing the door and lower cladding, just the sill/rocker cover. Anything I should know?

thanks

Another question if anyone can share their thoughts. I would like to paint the lower rubber cladding /seal on the bottom edge of the doors and fender body color, possibly also the door impact strips. Other than adding a flex agent to the paint, any concerx or negative experience that you'd like to share?