The rumors of a 1JZ and 2JZ having the same valve guide is wrong. But, we have a cure! Headgames Motorworks exclusive 1JZ exhaust guide! As depicted in the photo's the 2JZ exhaust guide is shorter in length than a 1JZ. And also most aftermarket guides on the market have a taper, which leads to galling of the hole during installation and sit completely inside the guide boss on a 1JZ. 
Our guides are precision made, with a beautiful rounded taper. And also feature the correct outer diameter for installation and the correct inner diameter for a easy honing to size. Something most guide manufactures forget about. The end user!