Just an idea, but I know Wal*Mart sells bumper recievers for pickup trucks. You could probably get one and adapt it to the bumper of your car, and then pick up the little thing the ball goes on that goes into the reciever and get the right high adjustment so it isn't too low.
I have a hitch that was pulled from an 86 cabrolet, seems like it would fit? in WA state, (any chance you will have another workshop up here anytime soon, interested in trading for the hitch? )
well anyways, send me an email if you are interested; purvisgs@at@yahoo.com