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I ripped out the POS GM liner and glued in black "Polar Fleece" fabric directly to the fiberglass. It is a perfect match for the Visors and looks better than stock. As a bonus I increased my headroom by 1". Has been in for 2+ yrs no problems.
Go to any fabric store and buy black felt material and fabric glue (spray on is easirer to use)
Pull the headline board (should be glued in and a little tough to remove but work around the edges).
Remove the old fabric and get rid off all old foam and glue (snad it off lightly)
Spray on glue and follow instructions and lay new fabric. Tuck in around edges and corners.
I did not use any glue when I put the board back into the targa top. Stays perfectly and looks great.