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-Hello, thanks for the opportunity is really exceptional, I can not find the following pieces:

3mmx19mm in fibra di carbonio, alberi in acciaio o ottone per cambi differenziali e asse vivo:
2mm asta in acciaio per alberi di trasmissione a perno e ingranaggi conici diff:
https://www.banggood.com/22mm-250500mm-1_52mm-Thickness-304-Stainless-Steel-Round-Tube-Rod-p-1064909.html?p= HD240528697332015103 da

Where can I find them? Or do you have photos to understand what they are?