go to one of your larger junk yards and tell them you want them to do a parts locater search. They will get on their bozo puter and find it in some other junk yard that is registered with that locater service.
I own a shop, and I have the sites for you. Check out this:
I do some restoration work, and have found these sites to be a lot of help in finding most any part for the classic Chevy's.
If all else fails; you can have your old trim repaired, and restored back to the original new like condition.
Glad to help out, Good Luck!!!