Crikey what a question! And for C207 at that i dare say some will scratch their heads and wonder what is a C207 anyway I was instructor rated on this death trap - to answer your question our seats were in the region of 10kg for a basic leather seat not especially weighty as this thing is of course certified to carry eight people although I operated this at 5000ft elevations and anymore than two people and full fuel used to struggle baddly.
as a ball part figure - best wishes flying it!