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Do the models affected by the spore cloud and granted "defensive grenades" get +1d6 for armor penetration for vehicles?

I assume yes.

No; but mainly because that is not what defensive grenades do to vehicles in CC.

They do count as being equipped with defensive grenades, so may make a Grenade attack on any Vehicles in close combat with said grenades(See page 63 of the BRB for what defensive grenades do vs vehicles)

So i'm right but in the wrong way?

Yerp.