If its the switch type (with run/stop written on it) it's the one pictured. These are standard fitting on that size engine.
2nd pic shows best price on eBay, that's not genuine MERC though. Picture 3 is genuine MERC
If you go for genuine MERC (quality better, rope rather than rubber cord which stretches once and stays extended.
"Turbo diesel" on here is your guy. Trader under the name Black Dog Marine, who give 10% discount to Rib.netters with delivery just a quid :thumbs
Peter ~ Boatsandoutboards4sale ~ email@example.com
~ 07930 421007