Just looked it up. Its the same thing as the others chevy not Gmc. These guys are the only ones that say gmc but I dont know why its say #2 harness. Their #3 harness isnt Gmc friendly and I dont see #1 harness on that page.
http://www.oldchevytrucks.com/cart/product.asp?prodid=EL172&i=9811%7C%7C%7C%7C%7C
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