This is a timely post
I'm at the point of installing the trim on my own seat.
Here's what I've learned:
On the 350F seat, and by the sounds of it, other SOHC4 bikes as well, the seat trim is molded to the seat cover.
My new seat cover came without the molding, so the instructions recommend cutting the old trim off the old cover and gluing it back on after.
I thought of using the door edge trim since the chome fell of my trim some time ago...even bought some, but the problem is the original seat trim has a lip on the inside which is used by the metal tabs on the underside of the pan to hold the cover on. Door edge trim doesn't have this lip.
So, I've decided to stick with the old trim and simply get the chrome sticker stuff like keiths mentioned. I've sanded off all the old chome with first a razor, than sanding with 400 grit, than wet sanding with 800 grit.
Rechroming the old trim is about the best bet. atleast on the 350F or any model that uses the metal tabs to hold the cover on.
Cheers, Matt.