Usually you'll only find 35/35 in stock at motorcycle dealers. Fortunately they're a rare exception in that they're cheaper than automotive counterparts.
Around 15 bucks at Yamaha.
Your late model's charging system will support a 55/55, but you may get excess heat buildup in that small housing. If it has either a plastic reflector, plastic lens or plastic housing I'd limit it at 35/35. Plastic parts tend to melt with high wattage bulbs and clear plastic lenses will go yellow on you even if they don't outright melt.