Ok so as a new owner of a B I was looking to see what was on eBay :
Just loved the custom designed Fiat Barchetta floor mats - all 4 of them
Ditto the 4 seat covers, not to mention the Barchetta rear seat dog cover but the winner has to be :

the Fiat Barchetta heavy duty dog guard - I'm tempted to ask a seller how one of those fits

Though the Fiat Barchetta roof rack bars came a close second......

Yeah its wierd out there in the real world!