Hi and welcome,
You could start with www'sor.com as many of their parts also have diagrams on their site so that may help in identifying the exact part/s that you need. There is also: CCOT.com , landcruiserparts.com , and loads more. Oddly enough it is also worth trying your Toyota dealer.
Tell us more about your FJ40 and we do like photos!
Regards,
Rodger