Thanks for everyone response.
I haven't seen any new white quarter panel trim for sale.
You wont Frank, because the new panels are made of a black plastic,and have to be painted to suit your colored interior, whatever that may be. In your case it's white.
In my case, i was looking into replacing my original panels with the new plastic repro ones, but was put off by feedback of the new ones not fitting properly or having fitup issues, and the seatbelt cut out holes and the stud holes, not provided for. I went for getting mine recovered, and did not regret it at all. I was delighted with the end result, and it looks a million dollers. Again i say to you, that if this job is beyond your trimmer, consider taking your business somewhere else to a company that can do the job sucessfully.
Have a look at my thread on interiors, and see pics of my finished quarter panels in vinyl.
http://www.7173mustangs.com/thread-austin-vert-s-interior-pics-tips
Best of luck,
Greg.