Ah yes, the infamous Megane 3 RS gearbox bolt. These often snap when enduring a high load, which they definitely do in these cars. Cheap enough to replace "while I'm there". Please note that this may come in a regular Renault packaging or in a Nissan packaging like pictured. It's the same thing though. The wonders of the automotive parts world.
Fits: Megane 3 RS 250/265/275 including Cup, Trophy, Cup-S and Trophy R models
OE Renault part number: 7703602318
OE Nissan part number: 11233-00Q0G
Unsure of fitment? Send me an email at mark@baguettepower.com and I can check it using your car's VIN number.