GU10's are commonly used in LED retrofits. There are also those recessed ceiling light modules you can buy. They're similar in size to your GU10 bracket but muc

GU10's are commonly used in LED retrofits. There are also those recessed ceiling light modules you can buy. They're similar in size to your GU10 bracket but much bulkier, and the whole thing needs to be replaced when the light goes out. On the other hand, I hear they are much more reliable (due to better heat dissipation, presumably).