Side reveal trim??  stainless??  is on my car,   I don't use any clips, I use black RTV and load it up tight as whale puzzy, and that's waterproof,  no rust that way....did the header strip the same way....in fact ,  my '72 vert used to have a leak over the top in rain storm....
I had noticed that a '73 Grandville Vert I had,  did have the same header leak problem,  even SNOW came in on one trip...never did fix THAT car....it had stainless over the top of the W/S same as my vette....
then I had a '70  Lemans Sport Vert....and so it had VINYL wrapped over the W/S  header and never ever leaked a damn drop....even into a hurry caine.....
SO when the stainless on my '72 was leaking,  I took a cue off that  and wrapped the stainless header in black vinyl,  been there for some 18 years now,  and NEVER leaked a drop since then....went through a Florida hurry caine  at some 80 mph some years ago, not ONE drop over the header....
It not factory purrfect,  it just works....
:clap::shocking::flash: