YEah, that rear kit isn't made anymore by ford. So whatever is left out there is all there is. But tons of places still carry it. IIRC, ford stopped making them years ago.
The guy that runs the Buy Ford Racing is a total douche bag and major dik. I wouldn't order from them. Tons of people (including me) have had problems with him.
i would try American Muscle or Speed concepts. There is another place that has a kit with the both for like, $400 or so, but i cna't find them on my computer (its really slow at the airport i'm at right now). i'll link you whenever i can find it.
2001 XL 2wd, 2.5L powerhouse Hurst equipped
building a 2.3l turbo monster engine
8.8 l/s, 4/4 djm drop
17inch cobra rims, 13inch cobra front brakes, 12inch cobra rear brakes