Look no further than WebElectric Products http://www.webelectricproducts.com/products.htm . They have the highest quality and best customer service you can get..........hands down.
I've been buying several different products from them and never had an issue.
if I'm not mistaken WebElectric is the ONLY one making the sequentials for the 2006 Mustang
Make sure you check out the pony grill insert too, it looks pretty awesome on the new GT's