Which brake switch - 2 pin or 4 pin?

[veeg33]

I would check it myself but zed is not with me at the moment. It seems like my switch is almost on it's way to the scrap bin, gave it a wiggle, cleaning and reattach the harness, it seems to be working for a few days and it starts thrown lights up again hence don't think i can ignore this further =) I can't remember it this is a 4 pin or 2 pin switch? Anyone has one handy to confirm or any changed one recently can confirm? Price difference between 2 and 4 is double (£12.99 for 2 pin, £45 for 4 pin). Many thanks in advance.