Dimensions of a hybrid clip on cycle fenders
Hybrids vary a lot. So do tyres and mudguards. It took two attempts to find some to fit my hybrid despite ruining thinner tyres than stock. And they weren't clip on. Your preference for narrow mudguards won't count for much if you're running quite wide tyres. Most road bike mudguards fit up to 25mm tyres. Most mudguards that fit more than that are big enough for up to 40mm (at least). These may then not fit inside your frame without being slightly bent towards the tyre. 

I suggest you spend some time with a ruler or callipers at the tricky points.