QUOTE(Darren C @ Mar 4 2016, 02:32 PM)
If you have all new parts on order (seal, padding and vinyl) with your windshield out, you'd be foolish not to change everything, as once the windshield is back in, it will be too late.
I'd take the 4 x M6 nuts off the dash top (access from the Trunk) and pry the dash up a little (you may find its stuck down initially) to aid getting the vinyl tucked in and around the vents easier. (This is based upon my guess that you don't want to take the dash completely out?)
You'll need to take the solid dash top off as the vinyl is glued under it. There's plenty of "how to" info on here.
Once off, remove the vinyl and foam pad, clean up (maybe repaint the vents) and then replace with new foam and vinyl. If it's not pre cut vinyl, use the old as a template and give yourself some extra at the base of the windsheild and around the vents to tuck under. You may be lucky with the 4 M6 nuts off to get a good tuck under and glue down. Otherwise the rubber seal will help keep it all in place with the windshield back in.
Don't rush it, take your time, you have a great opportunity to do a good job with the glass out.
Yes, I'm trying to avoid taking out the dash!