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I took a chance and picked up some of these Schumacher Atom ball studs.

https://www.amainhobbies.com/schumacher-atom-eclipse-low-ball-stud-4-schu4850/p754692

As with most Schumacher ball studs, they have the correct 4.3mm ball size for a RC10. However, they have a very low profile.

They look like a good solution for the limited clearance area on RC10 buggies, at the front steering and camber link area.
With them on the Tower and bellcrank, there is a ton more space.

Keep in mind that these have a M3 thread, if that bothers you.

I just checked with ball cups. Maybe just use them on the tower. They don't allow enough articulation at the bellcrank before binding.

Tower and center link (since those are the two that normally hit).

Mark Westerfield wrote: ↑Fri May 13, 2022 1:17 pm Tower and center link (since those are the two that normally hit).

I normally have trouble with the bodies of the camber and steering ball cups hitting, under compression.

The center link either clears or it doesn't. It doesn't change under suspension compression. Personally, I've never had problems with the center link, even with bulky RPM cups.