Screw on Alternator? What kind?

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Could someone tell me what kind of adapter I need to loosen the screw on the upper left of the alternator on a 1991 305? It looks like a torx 30 something, but I tried a 30 and just stripped the bit. 40 is too big. Is it a 35 or something?

Thanks! -Ben

[a1supersport]

Probably a 35...but I'm still trying to figure out what screw that is.

[Countilaw]

Are you asking about the belt tensioning bolt that allows you to tight the belt by leaning the alternator over to one side a bit?