Any vga cable with the right plugs works.
Longer, but whatever.

as you already attached a screenshot of the exact cable you need i'm not sure what the question is.

it may be worth pointing out that your prior setup was rather non-standard, having an input like that on the primary VGA card was a rare thing. so you're just trying to get a regular setup now with the pictured passthrough cable, and certainly aren't supposed to use splitter cables with 2 outputs. maybe the confusion is that you didn't know every voodoo1/2 card has an input for passthrough as well?

Well the thing is that if I use that cable in the picture, from the 2D card to the Voodoo2, I have no ports left for plugging the monitor 😀
Each graphics card will have 1 x VGA female port only.

you're supposed to plug the monitor into the voodoo card, which passes through the image from the primary VGA card and switches to the voodoo output when playing a 3d game.

But shouldn't the Voodoo2 be directly connected to the 2D card as well?
As in the screenshot, that would leave no physical ports available, that's why I thought about a splitter as a potential solution.

The S3 will be replaced by another card, with only 1 x vga female port.

not sure what is going on here. if you look up images of a creative voodoo2 it has the standard two connectors. did you mislabel the cards in that image?

2d > cable > voodoo >cable > monitor

Any standard vga cable works if it has the right gender.