Low Profile Dual Monitor Video Card

I need to find a solution for a PC video card that has dual output – such that I can have 2 monitors with the exact same display content. The customer wants to have the PC User viewing the monitor facing them (19-inch), while at the same time a client will be able to see the same content on another monitor (22-inch). The PC is a new Dell low-profile box so the slots are (I think) PCI-Express?
Thanks.

Jason