First, make sure the livery selected is one of the ones from an Aerial Simulations livery pack.

Pylons and Droptanks show up with pilot weights set from 200 – 250lbs. Every 5lbs changes the config of the pylons and tanks. The most reliable way to do it is by typing in the weight you want, the slider won’t always make them appear.

On Xbox, make sure to close the weight and balance menu to set the weight.

Can also be done with weight set to metric and using the equivalent weight in KG.