Hi Jim. i didn't think we had to mod the seat to register as a solo up here. I thought you only had to remove the pillion pegs and get it inspected and mod plated.
Anyhoo, I've got a solo seat of a police special in pretty good nick. It's still got the original cover though it's got some small scuffing around the folds around the base and a bit of what looks like paint overspray across the back of the saddle. I haven't even tried to get it off cos I didn't want to use anything harsh on it in case it stuffed it up completely.
It's got all the mounting brackets & frame pads still underneath but will require new brackets on the bike's frame ( or extensions of your original mount points to fit it) as it is a lot shorter than the original seat. I'm not sure about the ignition box location as this is off a Standard but I'll pop out to where my bike's parked in my wife's shed in the morning and check the clearance on it. You've got a Standard's tank on yours by memory so the front should fit nicely.