Online Community of Zenith Builders and Flyers
Not sure if this is the exactly what your looking for but they have the A5 in white https://www.mcmaster.com/order-history/choose-a-color-domed-head-bl...
I'm not sure. These only come with aluminum mandrels, not steel. Not sure that's acceptable for attaching front skin of vertical stabilizer. Also not sure what head size the Zenair rivets are or if our rivet gun works. Probably will. I'm just trying to save painting time for the rivet heads.