2 up seat for AC ZL

Hello guys. Well I was looking for another 2 up sled, but in thinking about it I don`t really want 3 sitting around, and I don`t want to get rid of the ZL, because it runs so good and is now in really good shape. So I`m looking into finding a factory 2up seat, which seems hard to find. I know I`ll have to upgrade the springs for the added weight. I`ve come across some universal 2 up seats. anyone use them and/or installed them on the older chassis'? I figured it would also make it easier to remove it when I only want and need the look of a single rider.

Thanks!

2 up seat for AC ZL