They are with the big galvanized stake. I just looked in current catalog my post man dropped off a few minutes ago and they are showing a new style stake. Stick with a Oz-Post
I recommend the Oz-post. They still carry it for $22.
I put screws inside post under cap from topside to hold in cross beam where I want it, they remain hidden and it eliminates it from sliding around.
I installed 3 of these last fall, the next day we had a vicious storm blow thru, Took down trees, lots of signs, broke of more that a few 4' x 8' on 4" x 4" posts and anything not bolted down. These big posts stood their ground thru it all.