Two questions…

Firstly, would the outrigger covers from a Rocket III Touring fit onto a 2011 Rocket III Roadster and, if yes, does anyone have a pair of them they’d sell to me?

I've bought a pair of Touring passenger footboards and I'd rather fit a pair of outrigger covers that would fit with them, but if not, then I’ll fit them by altering the OEM Roadster outrigger covers.

Thanks in advance for any advice.

No, you will need to alter.