The convertible top boot should match the UDF - Upper Door Frame color.

In the '69 GTX shown, interior is P6D & UDF is (E)B7 ... so the boot is "1915 EB7" from the Parts Catalog page above.
Although it has a typo & shows it for a 2 dr sports hardtop

On e-bodies (UDF - 000) it matches the door panels.