The 2000 and 2001 models are different than the 99 model!!! All the parts stores show that they are the same, they are different!!!!!
I would just start checking junkyards. I don't mess around online, just go and pull it yourself. That way yo ucan practice on someone else's truck, and you might score other goodies. I have stockpiled all that stuff, extra alternator, ac compressor, cvs and so on. Since Isuzu is gone, it will get more and more difficult over the years.
Don't quit, its well worth it!!!!