I figured it out today while working on the M818. The 800 series have a recessed pulley on their alternators like the one that you described as lining up with your set up . You purchased and 800 series alternator and that's why the 900 series pulley that I sent you didn't line up. Both of them are 60 Amp alternators but different brackets and input shafts and the cases are slightly different as well. I'll see if I can dig up a 900 series alternator next week, use the pulley and brackets that come with it and you should be fine!!!
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71 AM General M35A2
85 M1028 CUCV Chevrolet
87 M105A2 Pribbs Manufacturing
