I believe you would want a DPDT On-On toggle switch, which has 6 lugs in two columns of three, like so:
a1 b1
a2 b2
a3 b3
So you would have the points on the board which the capacitor used to occupy wired to a2 and b2 respectively, and then you would wire the caps which you would like to switch between on a1 and b1, and then a3 and b3.