Yes, they are the four star horns cut down. Two of the arms have holes that line up perfectly with the holes in the carbon arms, the other two need to be drilled and tapped. (You can thru-drill, but I prefer to tap them)
The key is to find the super flat head screws. I had some around, but have no idea what kit they came from. If I find them online, I will definitely post the link!
Crash wise... I wish I didn't have data to support this, but I do! If you asked me if these would ever strip in a crash, I would have bet you $100 they wouldn't. They are so hard to get on and off the spline with the outer metal reinforcement band (almost takes a gear puller to remove), I would have thought it would be near impossible to strip.
When my E7 went in full bore, I checked all of the servos and they all worked fine, nothing was rough, all of the servo sweeps were normal and no unusual amperage draw through the travel. I rebuilt the machine and during set up I couldn't figure out why the swash was off so much when everything was centered. When I checked out the elevator servo, I found the arm to be off a click. I just shook my head on how that could be. The arm was super tight, the settings in the radio and V-Bar hadn't changed. I finally pulled the servo arm off- (with the said gear puller) and sure enough the inside looked like it had been forcefully "mushed" a few degrees. It was so tight that I could hold it and try to torque it and there is no way it would move. I honestly think you could have flown it the rest of the servo life in that position and never know it had damage. I replaced that horn and all is good.
Long story short- I am very surprised, but glad to see they will strip and I think it dang near will take a direct hit to the swash to make this happen (note: my swash was completely lunched and the mainshaft was bent over so hard it pulled the entire upper bearing apart... as in the balls and ball race were all over the top of the frame!!!).
