UN-warp '68 grille pieces?

[67Charger440]

What is the go-to method to straighten a warped grille surround?  Gentle heat and a fixture?  I have 3 to work with .  My centers are mostly fine but the best one (least cracks and other damage) looks like it was sat on by a few weight-watchers candidates. 

Yes, I see the stickied post on grille restoration, but nothing seems to address this particular issue.

[Dino]

Heat and fixture is about all you can do, short of cutting and reweldingw which is a bit drastic.  Word of warning.  With this brittle plastic there is a fine line between heating until workable and heating until liquid.  Make your jig in such a way that you can gradually bring it back to its original shape, heat slowly and evenly as you go.  Start with the worst of them, you may end up ruining one.

Good luck