Fitted to the side trim panel behind the B-post. A gunmetal casting, powder coated in satin black. Could be chromed if you wished, although all the originals which I have seen were a flaky black paint finish. Artisanal made in England for AlfaStop.
 
Part Name: Spider Hardtop Side Securing Brackets, Set Of 2
AlfaStop Product Code: 1CWB165
Original Alfa Romeo Part No: 1495.58.012
Model: Guilia 101 Series, Giulietta 750 & 101
Quantity Per Car: 1