.../..the rear chrome trims have been missing from my car (the ones just behind the rear wheel arch).../.. But how are they attached?
I just re-fitted these to one of my Pagodas. They were attached with countersunk steel sheet metal screws, three each side. There was some rust forming around the holes in the fender, I cleaned and re-painted those.
Now, fearing the galvanic corrosion effect, I re-fitted my chrome trims using flat-headed countersunk M4 brass screws, through the fender and secured with a plastic washer and M4 brass nut on the inside
(The chrome trims are brass, of course)
/Hans in Sweden
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