The reason you do not have 6 leads is that the common or negative of each capacitor is one lead. In this type metal can, it is the can itself.
This results in 4 actual leads. The 3 marked as indicated in a previous email and the can being the negative.
Multisectional caps are still available — see here – https://www.tubesandmore.com/search/node/multi?cats%5B0%5D=112
By the way, the chassis of that unit you are working on can be come electrically live at 110/120 volts depending upon how it is connected to the A.C. Be careful.
It is also why the cap is shown in an insulated mount and not a metal one.
Hope this helps.
Regards John G. VO1 CAT