new alternator bolt size?

[bp71k5]

I just swapped in an 94 amp alternator from an 87 Blazer and found the thread size is different from the stock 71 alternator. I read a thread that said it's a metric bolt, but can't find it now. Anyone know the size off hand?

Brian

 

[mosesburb]

Should be 8mm 1.25 and about 25-35mm long.