Car tuning Kits

Hello,

First I'm pretty sure this has been answered several times, but as I'm new I hope somebody will explain it to me. I just bought the crew and its open world racing and sandbox styles with the customization are awesome. However, I am still getting a little confused with the Car tuner kits we can purchase after completing certain missions. As we progress we can purchase Dirt, raid, perf, etc. but how can do we upgrade to the level 2 kits and so on ? I leveled to 30 before taking my first Dirt tuner kit ? and I saw the level 2 offered at 30 I think ? At least I'm pretty sure I saw it.. but when I go back to the Dirt tuner shop level 10 for example around new york ? it wont offer it too me. Am I not progressed enough to get the higher tuner upgrades ? or am I missing something ?

Any help will be apprecited.

I didn't find the right solution from the Internet.

References:
https://forums.ubi.com/showthread.php/9 ... its-Forums
Animated Explainer Video Production Studio

Thank you.