Exhaust consumables - installation of Sport exhaust

Hi gents,

I am a recent onwer of a F355 - 1995, motronic 2.7. I am posting a thread in this section because I realised the F355 specific forum provided me with poor technical feedback. Hopefuly I can get more from posting here.

I have bought a Larini Exhaust package + test pipes. It is a used package and it does not come with gaskets. See pictutre attached.

The car has a stock system installed and I want to re-use as much of the parts as possible. Some of the parts are eye-watering expensive, such as # 1 and #31 in the diagram.

I need to order the consumables and potentially siezed nut/bolts. I believe I can do it myself, done it many times in jag e-types and other american cars, but never in Ferraris. However, I need upfront preparations (ordering) as I live in the Brazil and parts come from abroad. Lead time to get parts can be over 30 days.

From what I can see, I will need 4x item #22 (£8/ea) and 1x item 08 (£9/ea). The question is, whatelse should I order (blue and green in the diagram)?
- item 11 (£53 x2)? Expensive!
- item 31 (£25 x4)? Expensive!
- bolts/nuts/washers 13, 14,16,17,18,19,20,29,30,32,33?

The technical help from this forum is important and I trust your input will add a lot of valiue for this little project.

Your feedback will be much appreciated!
Thank you all!
Fred
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Thanks guys! So basically the ones circled in red are the only ones I will order. They are not expensive.

The blue circled items are not prone to damage, if I understood well, correct?