If your 96 harmonic balancer is the same as my 01, the correct bolts size you need to pull it with is M8 1.25 X 80MM. I Check out several puller kits, none of them had the right bolts until if got the OEM kit from Auto Zone for $ 16.95. They told me I could return it when I done with it.
Dave
01 GT Vert. Auto
3.73 gears
Dragon Plenum
70MM TB
Tuneable CAI
SCT Tuner
Flows
UDP
FAST A/F meter
wow, m10x1.50, the crank pulleys from both motors I have must be different than yours. the holes are actually closer to one of the intake manni bolts,however if I try threading one in it goes a few threads and then gets real tight,when I take it back out I can see it started to change the threads,I think thats the size but the pitch is different prolly finer. As far as the manni bolts I like your idea of using a dye to let me know which tap to use.