svwilbur,
thanks for the compliments on my 57.
i was able to dodge the rain drops and finally pull the cover off and get your measurments. here they are.
http://s251.photobucket.com/albums/...00/?action=view¤t=DSC02280.jpgexcuse my hand drawn pic. LOL. measurements are as close as i could get, give or take .250".
and when i am setting in the factory bench seat with the factory wheel, i have only about 2 inches of clearance from my belly. not much.
hope this helps. if you have any more questions, fell free to ask.
leonard