I believe you are correct about Ferrari:

"Ferrari Tractors are designed and built in Italy by the BCS Group." (https://www.ferraritractor.com/faq)

English Wikipedia gives up at that point, but itwiki has https://it.wikipedia.org/wiki/Ferrari_(azienda)

Google Translate: "FERRARI of Luzzara (RE) is one of the historic brands in the field of agricultural mechanization. Founded in 1954 as "Officine Meccanica Ferrari SpA", in the period of reconstruction and mechanization of the country, it was one of the most enterprising companies in the agricultural machinery sector."

Meanwhile https://en.wikipedia.org/wiki/Ferrari says it was founded in 1939 and doesn't mention tractors at all.

Ferrari (the car brand) and CNH (Case IH, New Holland) were both under the same ownership a few years back, so in a way you could say they were Ferrari tractors. Seems there has been some changes in the meantime, though.

> As a world financial crisis began to take hold, Ferruccio Lamborghini's companies began to run into financial difficulties. In 1971, Lamborghini's tractor company, which exported around half of its production, ran into difficulties. Cento, Trattori's South African importer, cancelled all its orders. After staging a successful coup d'état, the new military government of Bolivia cancelled a large order of tractors that was partially ready to ship from Genoa. Trattori's employees, like Automobili's, were unionised and could not be laid off. In 1972, Lamborghini sold his entire holding in Trattori to SAME, another tractor builder.

The name lives on in the ag market, but built by SAME, not Automobili.

https://en.wikipedia.org/wiki/Lamborghini_Trattori

https://en.wikipedia.org/wiki/SAME_(tractors)