front pipe replacement, 1993

My front pipe recently separated from the cat converter due to corrosion. It's a full separation, like i cut it with a hacksaw.
I ordered the following:
new front pipe
flange for front pipe-manifold joint
2 bolts with springs
clamp for front-pipe to converter joint

Am I missing anything? I was looking at the existing spring bolts, and it looks like they thread right into the manifold, I didnt see a nut on the other side of the bolt. Does it really just thread right into the manifold? If so, what's the proper way to get the existing bolt out? I don't want to strip any threads on the manifold.
I'm really not that cheap that I cant take this to the mechanic, I'm just embarassed driving this thing right now! Sounds worse than a Mack truck.

There is a stud with threads on both ends that screws right into the manifold, and then then there is a nut on the other end. They are prone to be difficult due to rust/heat exposure. For me to get it off, I first spray liberally with PB Blaster and let soak for a while. I then just use a breaker bar, 15mm impact socket and several extensions under the vehicle with the vehicle up on ramps/jack stands. I use about 2 feet worth of extensions I would guess. After I get it intially busted free and turned a couple times I pull out my impact ratchet and spin those babies free in less than a second per side. Sometimes the stud will come off with the nut and other times the nut will come off by itself. It does not matter. Do not worry about separating the nut and stud if they are stuck. Just reinstall the same way in the same spot and it will be fine.

OK so I must have gotten misled byt this picture of the manifold "front flange" on Rockauto. It looks like this is a flanged bolt (one piece), or is it a stud like you said with a nut threaded on the end? I cant really tell from this picture. Anyway I think I bought this too.
http://info.rockauto.com/RB/Detail2.html?http://www.dormanproducts.com/images/items/hwrap1/03136.jpg

Should I put some of that anti-sieze silver paste on the ends of the threads too when reinstalling the new one? Not sure if that helps prevent later corrosion.

OK so I must have gotten misled byt this picture of the manifold "front flange" on Rockauto. It looks like this is a flanged bolt (one piece), or is it a stud like you said with a nut threaded on the end? I cant really tell from this picture. Anyway I think I bought this too.
http://info.rockauto.com/RB/Detail2.html?http://www.dormanproducts.com/images/items/hwrap1/03136.jpg

Should I put some of that anti-sieze silver paste on the ends of the threads too when reinstalling the new one? Not sure if that helps prevent later corrosion.

It is a stud with a nut threaded on one end. Sure, you can use anti-seize. But I never have and I've never had too much problem getting them off. (I've never broken one yet)

And since you are not reusing your original stud/nut combo, then if you find that you need to get the stud out, use one of two methods:

1. Use a smallish pipe wrench. Whatever size will fit the space.

2. Put both nuts on the one stud and then turn the inner stud with a wrench counterclockwise until it is free (actually hold the wrench in place while you either whack it with a large hammer or sledge or while you lay on your back and push the wrench with your foot.)