A quick DuckDuck gives you a full breakdown on what the Gringo is. A cheap aluminium thing. Seller should have done their homework. I guess you could have done yours too, but yeah the fault really is with the seller.
I did do a bit of googling and indeed couldn't find mention of a steel gringo, but figured that maybe there had been one and I just couldn't find it. Hard to know exactly what it is without info on model year etc.
A quick DuckDuck gives you a full breakdown on what the Gringo is. A cheap aluminium thing. Seller should have done their homework. I guess you could have done yours too, but yeah the fault really is with the seller.
Ask him to send you £10 in compensation.
He's probably glad to be shot of it.