layin-frame-95
+1y
Paul,
Godfathers customs has them(Godfathers.com)Stylin concepts has them(stylinconcepts.com)
I'm sure there is some more, but they are the 1st 2 I though of. Stylin will probably be the cheapest. As far as the notch, you don't have to, but I would suggest it, especially if your truck is a X-Cab. When mine was just lowered 3-4(4" flip kit for rear) I didn't notch mine and it rode really rough(the bed set on the frame)
Rob