Cam Position Sensor Replacement for 97 355

I am replacing my cam sensor this week and found a Bosch item at eBay. Please check if this one is fine and advise bolt size - I checked mine and felt an M5 hex seems to work but can someone confirm.

Background is that my car once fully warm feels like it hunts for the right rpm as I coast lower than 10mph at stops. Feel I need to hit gas pedal to settle. Since the cam sensor is easy to access up top I plan to remove, inspect and for $150 why not just replace for good measure. With my MB dailies over 10yrs this cam sensor seems to fix such ills. My 355 idles, runs and accelerates beautifully apart from the described problem and honestly was shocked how easily accessible the cam sensor is on a 355. Figure to remove the intake tubes on right to get bolt access. So 10-15 min job?

 

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Patrick- do you remember the bolt spec/size to remove?

 

M6 bolt size- Thanks Daniel!
BTW I could not find this sensor in your website. First checked Ricambi (of course) as I know this is a critical unit for the engine management.

 

For clarity, this is what I am asking about.. Amazing how often this small item is a culprit for modern engines. Thank goodness it's a 5min process to reach in a F355. Another god send from the engineers apart from clutch access.
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oh... Quavion - thanks for pointing out the Ricambi part no. 150866 - $130.. Better to source from 'the source' than fleabay! Guy's even based in Latvia so it would have taken a while to arrive.

 

Update: Ricambi delivered my new sensor and screw in 2 bus days this week, but I've still not managed to remove the old unit. The screw is solidly fixed, despite attempts with a rubber band, larger/torx and even a screw puller. It is an M5 hex bolt, at least when installed. Worried now I could grind it beyond the screw and to the threads th my extractor.

Tips anyone? I am now seriously thinking of driving to a proper expert to take over extraction before I do irreperable damage.

 

Thanks guys! Will tackle soon.