There is some original equipment that can be used but finding it is difficult and, often, expensive.  Our examples include instruments, Rotherham pump and Aldis sight.  Some equipment can be made new to original plans and for safety may be better to use in an operational aircraft.  For us this includes the tanks and seat.  Often original pieces, even if in poor condition, can be used for vital information for re-construction.  Follow the menu under engine or equipment for more details.