Where do i find nyata timber

[M@rk]

Im in the midst of repairing the timber cabin of a classic 1950's motor launch. It had had a rebuild about 20 years ago but the has been damaged by rot. Im now having difficulty sourcing timber to match the nyata timber. Ive been led to believe that either red gum or black but has the same pink red hues. any ideas or a stack of timber?
Im in Perth WA.