'71 hood trim had a flange and screwed in from underneath the hood. Mine has been missing so long I don't remember if there were also clips between it and the front of the hood, sorry. There was a long time where the '71 trim was unavailable and not reproduced; I remember buying NOS replacement trim that didn't have the flange, so used clips of some kind, but its packed away so I can't check the fastener kit that came with it.
The pics of the trunk molding clips look like I remember mine did when it came off.