I wanted to know the part numbers for the FE2 sway bars themselves, where I can get them, and some general info on how hard (or easy) they are to put in...?

There is a very good techinfo article wrote up on that

Bonneville FE1 supsension upgrade to FE2

all the info you should need is in there

Not sure of the part number, but any Bonneville/LeSabre/Olds 88 with airshocks in the rear will have FE2. F41 bars will also work IIRC.

So where can I get this bar from? I want a new one and I've checked advance auto online and autozone online with no luck...

From www.gmpartsdirect.com

Watch out for shipping. And be advised, you should replace your endlinks at the same time, and your front and rear swaybar centerlinks won't fit the larger bars. You'll need all that too.

Now you see why we suggest a wrecker.

I got new endlinks for my current swaybar in the rear going in with my fe2 upgrade (cause right now I am not doing new swaybars)...can those endlinks be used with the fe2 swaybar or are those different too?

Endlinks will be the same. It'* just the bar diameter that makes the mounting bushings different. The holes at the end are the same between bars.

Correct. Endlinks are the same.

CENTERLINKS on both bars are different.

So I need center links for both front and rear....Thank you guys

Also, the GMPartsDirect.com does not seem to want to tell me shipping on the bars, they just give a "submit order" and the total they show before that is WITHOUT shipping, I looked all around and could not find a way to figure out the shipping. The thing I did read on their site under "FAQ" was that indeed, the shipping charges are for more than just shipping, thus are high. Can anyone tell me around how much this place actually charges? Also can't I get these parts from a Dealer or where else should I go? (For the front and rear FE2 Swaybars, new)...