I am about to try the zebra one because it looks different to the one I have used previously lol I found it for an NPC code but not for the actual steed itself >.< As far as I am concerned if the zebra one works then they probably all work

YES I got zebra so these ARE the right codes! There are actually TWO codes for steed in this but it is NOT /steed 12 105 88 20 Zebra Steed lol it is /steed 12 142 39 46 zebra