Camco makes a dog bone a little cheaper.
What I'm doing is trying to make an 8' 30 amp cord to run my genny as we go done the road. Also for power failure as my wife uses a c-pap.
I've got a scrap 28' 30 amp cord(rv) with no ends.
Since no one makes a 30 amp 90° twist lock I'll buy the dogbone cut inhalf and splice to my 8' cord, not ideal, but if done neatly should be ok for the little use it will get.
Oh, thanks for looking for me, I did a great amount of looking too!!