longshot but... R9 rollcage, same as r11?

[alister]

I know the r9 and r11 are meant to be the same under the skin, so does anyone know if a cage from a 11 would fit a 9?

[alister]

Scrub that, I'm retarded! R9 4 door, r11 2 door, not going to fit!
I was just looking at the r11 on ebay and wondering if any bits off it good for my 9.