I'm going to guess driver B as Nigel Mansell. I know he broke his back around then but can't remember how exactly.
Another guess would be Circuit X is Brands Hatch?
Driver A was Andrea De Cesaris
Circuit X, Oulton Park?
Another helmet question, which F1 podium finisher had this skid lid?
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If I "like" your post, it means it was correct.
One of the Fabi brothers... I want to say Teo?
He liked it, so you get to ask next👍