yes have all heard of them and many have installed them. you can get them from many different sources, such as West Coast Classic Cougar, Classic Design Concepts, and many more.....
here are some links to this topic in the S197 section..... http://forums.stangnet.com/showthread.php?t=573582&highlight=sequential http://forums.stangnet.com/showthread.php?t=597629&highlight=sequential http://forums.stangnet.com/showthread.php?t=542348&highlight=sequential http://forums.stangnet.com/showthread.php?t=533489&highlight=sequential http://forums.stangnet.com/showthread.php?t=547230&highlight=sequential
Sequential Tail Lights Buy the CDC Sequentials, I've had them for months and no problems, easy install, competitive price........ Great Customer Support
I got mine from webelectrics, easy plug in install, have worked perfectly since March, $150 with $40 back if you mail them your old harness.
WebElectrics sells a set on Ebay for 69.95. They require cutting and splicing a few wires, but it is WAY easy. Their instructions are crystal clear. Took me about 10 minutes per side. I suggest using a butt splice connector and heat shrink tubing instead of the wire nuts provided with the kit, however.
http://www.ponyperformance.com/specials.html $87 (shipping included) I have them on my '96 Cobra for the last 4 years. They operate at the perfect speed and easy to hook up. Tim from www.ponyperformance.com is great to deal with. I believe the designer is named Lawrence Mazza. He sells other electrical items on his own site. I think this is it: http://www.webelectricproducts.com/products.htm
Sequential/Chaser tailights Look into Meter4it.com. I think these look so much better than regular sequentials. It even gives you 3 choices, stock, sequential and the best, Chaser lights by just changing a jumper. I'm getting them for my '06.