Ok ....I would like to install a new seat on my HD Champion trike. When I look at seats to fit my HD 2010 Electra Glide many of them say will not fit trikes. I don't see anything that would be different then a 2 wheel bike. Does that mean it will not fit HD Tri Glides or it will not fit any trikes. If so what do you look for to find seats that fit.....thank you Dave