missing

I somehow managed to misplace my radiator drain plug (petcock) while working on the thing. I may have found a replacement but the item says it fits a 2001 Aztek. My question is, is there any difference in a 2001 radiator vs. a 2004 model? If its the same part I can order it and get this handled...

I desperately need some help, with my 2001 sunfire 2.2 5 spd, for the past 8 months one of the cylinders has been stopped up and starving for oil, and been making a ticking noise, sometimes it doesn't do it and sounds fine, but this morning I started it and put it in gear and started rolling and...