Made in the UK exclusively by Lambretta Upgrades. A carb grille with the  Trojan helmet record label logo. Comes in highly polished 304L stainless steel and comes with button allen bolts, flat washers and nyloc nuts. This has no mesh, just the grille. 
 
Outside diameter is just over 3 1/2 inches (90mm). Requires 2 1/2 inch (63mm) hole cutting out in pane.