number of S-IVB ullage motors

I think this has been discussed before, but the famous onboard film of
an S-IVB pulling away is said to have been from Apollo 6. It shows
the S-IVB having three ullage motors. However, I thought that the
S-IB version had 3 ullage motors and the Saturn V version had only 2
ullage motors. What is correct?
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Jud McCranie wrote:
I think this has been discussed before, but the famous onboard film of
an S-IVB pulling away is said to have been from Apollo 6. It shows
the S-IVB having three ullage motors. However, I thought that the
S-IB version had 3 ullage motors and the Saturn V version had only 2
ullage motors. What is correct?

The former. The footage is really from one of the S-IB flights (too lazy
to look up which one, someone else will step in...). It is often
juxtaposed with the footage of S-II separation from S-IC on one of the
Saturn V flights (see previous parenthetical) so the meme got
established that the S-IVB footage was from a Saturn V flight as well.