Made in the UK exclusively by Lambretta Upgrades. A carb grille with a slightly 'tongue in cheek' RB 125 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.