pulleys and a timing belt

I got crank, alternator pulley, and cam timing sprocket.
However, timing sprocket did not work in my truck.
There are two types of timing belt on 92 model, and
it depends on the manufacutured date.

If the truck is manufactured before 1/13/92, it should have square teeth.
And the timing sprocket should work.
If the truck is manufactured after 1/13/92, it should have round teeth timing belt.
Racer Walsh timing sprocket will not work.
I gave Racer Walsh this info, but I'm not sure they remember it...

This alt pulley did not work well in my truck because
it was undercharging the battery at idle (around 10V and it's not enough).
I may need a smaller Alt. pulley(overdrive) if I want electric fans.
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