Go into your Tornado aircraft folder and look for the tornado_data.ini file (your data file may be named slightly different). Open that file up using Notepad or something similar.
Look for the [LeftWing] entry, and add this line just above the VariableGeometry=TRUE line:
SystemName[xxx]=SidewinderStationLeft
Where xxx represents the next number in sequence.
Do the same for the [RightWing] entry, except the line reads SystemName[xxx]=SidewinderStationRight
This adds a spot on each wing for Sidewinders.
Now, go further down in the data.ini and look for the // Weapon Stations line. Add the following paragraphs:
[sidewinderStationLeft]
SystemType=WEAPON_STATION
StationID=12
StationGroupID=6
StationType=EXTERNAL
AttachmentPosition=-2.350,-1.7,-0.3
AttachmentAngles=0.0,0.0,0.0
LoadLimit=1400
AllowedWeaponClass=IRM,2IR
AttachmentType=USAF,USN,UK,RAF,NATO,W_GERMANY
ModelNodeName=pylon_inner_left
LaunchRailNodeName=LAU-105
MinExtentPosition=
MaxExtentPosition=
MovingPylon=TRUE
RotatingPylon=FALSE
[sidewinderStationRight]
SystemType=WEAPON_STATION
StationID=13
StationGroupID=6
StationType=EXTERNAL
AttachmentPosition=2.350,-1.7,-0.3
AttachmentAngles=0.0,-3.0,0.0
LoadLimit=1400
AllowedWeaponClass=IRM,2IR
AttachmentType=USAF,USN,UK,RAF,NATO,W_GERMANY
ModelNodeName=pylon_inner_right
LaunchRailNodeName=LAU-105
MinExtentPosition=
MaxExtentPosition=
MovingPylon=TRUE
RotatingPylon=FALSE
Couple of notes. Make sure the StationID= lines are the next numbers in sequence. Also, make sure the StationGroupID= lines match with each other and are not duplicated, otherwise, you will get loadout problems. If you're not sure what I'm talking about, do some research into 'weapon loadout' in the various SFP1/WOE/WOV forums that exist around the internet.
After that, save the file and you should be able to duplicate what you see in the screenshot. Just make sure you always load 4 missiles or none at all...if you load 2, you'll see the missiles buried in the middle of the pylon...which won't make sense.