Oh, Darn-Darn-Darn-DARN!!! (jumps up and down) That's not really what they wanted to hear.............+1 on Sachi's comment.
I doubt anyone makes a kit, so if you were so motivated, you'd have to have a shop make you a set of modified dogbones.
A re-shaped seat is probably your best bet. Maybe Herman Munster boots, too.