1156 and 1157 are 12v bulbs, for what it's worth.
I've used the 1154 6v dual filament where applicable as tail/break and hi/lo headlights in a pinch. They go on old tractors and pre-66 VW's. They aren't 5/10, but more like 5.?/16 ? watts. A lot of auto parts stores have them on the shelf for about $6 a pair.
Then, if need be, pick up the exact bulbs from your favorite moped parts online store.