I doubt these actually have a name since the whole device looks like it has been fashioned out of parts that were intended for other uses, how ever I would assume you need something to serve rather same purpose to use yourself?
Here you'll see pronged alligator clips which could easily be adapted to do the same thing, you could easily make the base out of small bore PVC pipe and elbow/T-joints, alligator clips are available in many different sizes and have a multitude of uses including hair care and model making, you'll easily find a size suitable for your controllers if that's what your after.