70-73 Camaro lower rear inner valance source???

[Tom Miller]

Hello,
a friend of mine is restoring a 71 Z/28, and he needs the lower rear inner valance that attaches to the trunk floor and ties the rear subframe rails together.
He can find a listing for 67-69 and 74-77,and 78-81, but he can't find a reproduction for the 70-73's?
Any help would be greatly appreciated, as the resto is at a standstill until this piece is located, and he's on a short deadline. Rustfree used would work too.

Thanks for your time,
Tom Miller