If you were going to buy a headliner?

vinyl headliners will take time to relax after you unfold them. If its hot out lay them out flat for a few days. Nothing worse than putting one in and finding out the damn mailing creases are still showing even though you 'bout ruined your fingers trying to stretch it over the dragon teeth. Maybe you can tighten it with a hair dryer, maybe it will make it worse, test on a scrap piece. you want it to shrink a smidge, not stretch.