Once your ready to apply your new decals mark the frame with a pencil so you can position the decals in the correct place.

35mm back for the top tube decal.
15mm down for the downtube decal.

The plate sticker is just central.

For the models that have the sticker on the downtube.
50-60mm under the topframe tube or
15mm under the downtube decal.

These measurements are approx so as long as your there or there abouts as they varied from bike to bike (no more than a couple of mm out) they will look wicked