Sagaris badge- Remove the rear speak grill and undo the 4 screws holding the speaker in place. When the speaker is removed you will see the 2 bolts holding the original on.
T350- Open the rear cubby hole with the tyre weld in and undo the 2 bolts holding the badge on.
yes, did this myself at the weekend, finally got round to it. The grilles are seated over the speaker on a snug fit with a gasket, but they are not screwed in, the four screws are behind, so they need a bit of coaxing but don't force.