Fits 1980-1991 Grand Marquis Power Window Master Control Switch Mercury Switch Doctor branded switches are manufactured to the highest standards available, and are identical in appearance and function to your stock switch. This switch is the complete unit you need including buttons, circuit board, plug ins, etc. Switch Doctors hassle-free lifetime warranty is included free with all Switch Doctor branded switches. Your switch is fully covered while you own it  its that simple! Additionally, should you need to use this warranty, the process is easy and comes at no cost to you. Ships within 6 hours, on average, of order completion. Shipping includes delivery confirmation for the United States and 20 other countries! Free installation instructions and support are at Switch Doctors website or talk to one of our experts at 678-389-6725.