Try Octagon Motors in Vancouver, Canada. I was in the store a few weeks ago and they had the underdash panels in stock.
https://www.octagonmotorgroup.com/
Telephone: (604)253-4145
Fax: (604)253-0205
Out of Town Orders: 1-800-459-0251
https://www.octagonmotorgroup.com/
Telephone: (604)253-4145
Fax: (604)253-0205
Out of Town Orders: 1-800-459-0251