Jimny Spare Parts - Safety Places where to buy

Hola Amigos 

Thanks for a warming welcome from each of you! as I said...I'm in the waiting line to get my new Gen4 2021 Suzuki Jimny in Mexico, If everything runs as planned I will get my vehicle next week (I dont think so...haha) anyway, I'm started to read all manuals and FAQ on this page to get a quick speed on this world it should be easy but I'm excited. 

I am fanatic of the sound, I know Jimny is not the car to have 10 speakers or great sound system installed. my question to all you is to recommend me safety places to start buying the accesories 
my list is big and my wallet too short:

1. Roof Rack
2. Addition of 2 Speakers  in the back side (for this I know there is a kit Genuine Suzuki 2019 JIMNY Rear Speaker Upgrade Kit 990E0-78R32-050 99197-77R00) however is just sell it in UK 
I'm worry because here in Mexico, the dealers are not ready for this car, I dont think even Suzuki is ready however they decided to offer the unit in the country but I dont think they have the accesories ready or anything like that to offer to the customers.
this the link of the item:  Rear Speaker Upgrade Kit
3. Front protection
4. Side Bars
5. Offroad suspension (Not sure on this case as I think Suzuki said if we change it we will lose the factory warranty)
6.Snorkel

Based on your experience if you can recommend the essentials accesories or the first steps again based on what you have learned on this , that can help me a lot !
Thanks again and it has been pleasure so far
Saludos
Adolfo Guzman 

I got the speaker upgrade kit from here for both front and rear. I fitted  THESE PIONEER SPEAKERS  from Amazon.

For side protection I don't think you can beat these  Jimnybits Rocksliders

Any idea where I can buy the hard plastic back cover tire?
Thanks!

the first one, the half mid size.