I have passenger peg mounts that the folks at
noblesvill Honda made. They will accept any pegs. They don't detract from the looks of the bike. I did consider the Ricvo passenger mounts and floorboards, but i just didn't like the idea of drilling the sidecovers, but other said it was no big deal, and they like the looks.
I also have the corbin 2 up seat. Only one i know of.
Don't get started with the windshield. there are many and various preferences among the people here. I have the windvest, but others have the Switchblade system and the Memphis shades windshields. I can't say which is better, just they each are a little different, so it depends on what your preferences are.
These mfg's and message threads are available among the various posts on this board.