Silly question - fairing

[bolverk]

I'm still on trying to make things comfier for my fiancee riding on the pillion and it occurs to me that CB900 fairings sometimes come up for sale. Does anyone know how much of an adventure I'd be in for if I made an attempt to install one on my '82 CB650SC? I see an '81 fairing for sale right now that I might consider picking up if it'd work without too much effort.

-Dan