Out of curiosity, why do you have so many (3) Termi exhausts for sale? What all is cosmetically wrong with the exhaust? Anything missing for install? Screws, brackets, gaskets, etc. I'm interested.
These can fit 899/1199, they will just need the y-pipe adapter from termignoni or the 1299 headers as you stated.
Y-Pipe Part #D155Y DUCATI_PANIGALE-899_D155Y - Termignoni
Also, what are you willing to do with the 1299 headers?