if it's a Shadow there is a small BA fastener at the leading edge of the strip. You can access from the headlamp housing or removing the inner fender lining. Suggestion: squirt PB blaster or Kana Kroil to get the nut off. The nut holds a "shoe" that slides behind the trim.
The front doors have a small acorn nut on one end, and the rest pops off.
The rear waist trim has a shoe on the rearward end of the strip, accessed from the boot behind the tail lamp.
1980 SWII LRL-41587C FInj
1976 SS LWB LRE-23114 Harkness RR