Mid controls - You could probably do an even swap or even make money because a lot of people don't want mids...but the Roadster really calls for them. Shocks - You can buy used or takeoff FLH air shocks (13") from ebay for around $50. For another $5-10 in parts(Schrader valves and washers) and a half hour you can shitcan those stockers and bolt up an air system. Seat - as already has been said - the stocker sucks BAD. I had a mustang couch on mine and it was super comfy, but looked like shit. Fuck it...I sat on it more than I looked at it. if you haven't already, check out http://xlforum.net/ Chances are, if it's been done to a sportster, some guy there has it documented. Great resource.