Right now I am experiencing trouble with my car, a 1994 Lincoln Continental. Both the wiper motor and one rear air shock is out, but these are my questions. When I call to ask about the wiper motor, they ask if it is single or dual plug. What do they mean? Also, is there anyplace that is secure and I can find an air shock at a bargain (I am asking more for the hell of it)? Thanks. Wanna kill these ads? We can help!