Honestly, you are better off asking China since they are supplying Cuba with buses on credit (meaning free). Not sure if Russia is still selling Ladas to Cuba (meaning free).
If you want to sell auto lamps and car parts to Cuba on credit (meaning free) then try to go to the Havana International Fair that just ended or an Alimport conference.
I don’t know of any company in the world selling car parts in Cuba.
Forget about the private market, you might be able to sell into the car rental market (Havanatur) or military vehicles.
Unless you are ready to commit long term to getting deep into the Cuban government bureaucracy, I would suggest waiting until Cuba is more business friendly.
