I dealt with different types of front endlinks; the Motorcraft replacements are bigger that the ones that came OE, the Moogs are even beefier, heavier, and have grease fittings on them. I went with the Motorcrafts... we'll see how long they last.
I hear a 22mm or larger rear sway bar gives the car more neutral handling. I went ahead and put Prothane poly bushings on my stock one since it was so cheap and simple, it made a nice difference. If you do get poly sway bushings you'll need some heater hose with hose clamps or clamping collars on the bar to keep the bar from sliding side to side.
You can do the same for the front bar, but they're harder to install and harder to grease if they start squeaking. I'm gonna try to put some grease fittings on mine before I install them to make them greaseable.
'03 SVT EAP "Eurotrish Bennett"