Hi, I'm looking for some RC ballcups like the purple things in this picture.

Normal RC ballcups have a hole at 90 degrees to the threaded end. I need ones that have a hole directly opposite the threaded end resulting in the ball stud and ballcup being colinear. I've spent ages searching Google but I can only find the standard ones.

1) Do such things exist?
2) If so, what are they called?
3) Can anyone recommend a good place to buy them (preferably in the UK)