You have several options. I went with the worst one......most expensive. I didn't know what I was getting into when I started, and the cost ballooned to well over $800, which doesn't include the underseat carbon crankcase breather box.
My way entails getting a new subframe, new mono tail section, new mono wiring harness and new mono latch hardware.
If you're keeping your biposto subframe, you can probably get by with getting just the mono tail section and latch hardware. If you get a mono subframe, you may need a new rear wiring harness. There are some that made the old one work, but I didn't.
Easy way: new mono tail section and latch hardware.
Hard/expensive way: new subframe also.