Actually,Thinking back on it we mostly loaded on the Port shoulder pylon but both shoulder pylons had HD ERU's fitted & the SWAC-3 (Special Weapon Armament Control) panel in both cockpits,all switches were sealed with copper wire & crimped tags,removed by the Aircrew just before release) were for both pylons.The center pylon was NOT fitted prior to 1991.
We also loaded both types as well & the HAS which contained a Training Jet (out of flying hours,no engines ect) belonging to the WTC (Weapon Training Cell) had both types for practicing with)
A full load,ammo for the cannon & AIM-9's would be carried as we bl*ddy well loaded them as well on excersises!