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I have a stock '03 EV seat, with a King of Fleece (R) cover on it. I don't know if it will fit your bike, or if it is any more comfortable, but you can have it for shipping and a donation to this site.Ned's seats are good- I have one and it is comfortable (it's a loop frame seat, though).J
There's not much room to play with Calvin seat due to the left jug hitting your knee going forward and and the need for pillion seating in the back. As I recall the Corbin sacrifices the pillion seating some length wise. There's always a compromise.You probably want something more like the Guzzi King/Queen that's on my EV . It's about an inch taller, wider, flatter, and has a sharper rise to the pillion seating. It looks similar to the Ned's that I've seen before as well. I can measure mine if you go custom.