Guys, I've got a 71 with the hoop style headliner but it's missing the two long trim pieces (metal) on the sides (from the front windshield back to the sail panel). In addition to the trim pieces themselves I assume there are mounting brackets or clips that hold them in place. BTW, the setup changed when Pontiac switched to the backboard-style headliner, I think in about 73. Anyone know what's required for the trim installation and how it's done?