I couldn't find the locking type used on our bed.
I simply measured the devices and ordered these from Amazon. The only concern I had was the ball-socket size, I took a chance with the Amazon parts...but they worked fine; even though I could have easily returned them.
Even if that was a problem, you could buy compatible mounting brackets.
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
These work fine, actually better than the locking type; they hold the bed up without having to hold it.
Ron