Finding reclaimed or reproduction door frames?

Hi - we're at the (near) end of a renovation, and the one thing we haven't been abel to find is a frame to go around a very large/tall double door to fit our house (build in 1901).

Does anyone know of any wooden reproduction places that may have this timber that can be cut to length, or alternatively, a place where reclaimed materials from old houses can be found?

Anywhere in or around Brussels is best, but willing to travel if needed!

Many thanks

Yabby