Well there is 2 things wrong with this ebay ad.
"Up for sale is an aluminum front bumper brush guard in good working condition. This item is from a clean and well maintained 1994 Yamaha Warrior. " That pretty much says they knew what it come off of.
But read this part carefully, "We have parted out this entire unit, all parts from this tear down are currently up for auction here on eBay, Please click here to visit our store. and see all other parts from this tear down. Many of the parts from this unit may fit other years, makes, or models. Please do your homework, YOU ARE RESPONSIBLE to confirm fitment, the best way to tell is to compare part numbers from year to year online, or call your local dealer."
In there is does state MANY of the parts fit other years its up to you to know what fits. That part might be a battle with ebay, they can say he did say make sure part fits that year, BUT then again if he deals with this warrior stuff all the time on ebay he should know what parts fit what years. Ebay won't know, and that who you are going to have ot convince.