Not so sure about Monsters, but other Ducatis of the early 2000's had plenty of wide mushroom-head screws holding tank trims and mudguards on. Being plated steel, they often became grotty and for years there has been nowhere that can supply the same screws in stainless. Last year, one of the ST list found the following items which are excellent and available in various lengths. Three cheers for the Supplier!
https://www.ebay.co.uk/itm/Stainless...53.m2749.l2649