Gearboxes in 1991: which had 5 gears?

[gold333]

I am trying to find information on F1 gearboxes from 1991. Specifically which teams used only 5 gears.

I have conflicting information that the AGS JH25B and Coloni C4 used 5 gears but elsewhere I am seeing 6.

Can anyone answer this?

[CMSMJ1]

I'd think only a V8 would have the torque for 5 speeds but then these small teams would surely be buying an off the shelf box?

What was available then?