Those are cast aluminum pieces. The use of a heat gun or oven will aid in re-forming the brackets.
A torch can be used but extreme care needs to used to ensure you heat the area evenly and minimally.
Take your time and only straighten the bracket a small amount at a go. Allow it to cool and re-position clamps as needed. I use a thick (3'8") flat plate as my jig/base and numerous washers to act as shims.
Attempting to "speed up" the process will result in stress cracks in the casting. You may not see them but they will be there.
You can harden the part after you shape it by heating in an oven at 160C (325F)for a minimum of four hours preferable eight hours or longer, allow to air cool, re-heat to 177C (350F) for a minimum of four hours or at least half the time you originally heated the piece.
I only do this for the windowless coupes as the regulators are as scarce as hens' teeth.
That rail is in bad shape. Your door weather stripping needs to replaced. Treat the rusted rail with rust dissolver and follow up with some rust preventative treatment (POR15 or its ilk).
You don't want to end up with this:
http://www.peachparts.com/shopforum/attachments/diesel-discussion/157009d1587746242-window-regulator-blues-slide5.jpg
http://www.peachparts.com/shopforum/diesel-discussion/331671-window-regulator-blues.html