Guys I got some info from a friend that includes correct mesh names for the weapon stations, however it seems this should be handled in max. Here are the entries if you want to try:
[LeftWingStation2]
SystemType=WEAPON_STATION
StationID=1
StationGroupID=1
StationType=EXTERNAL
AttachmentPosition=-2.684,-1.98,-0.566
AttachmentAngles=0.0,0.0,0.0
LoadLimit=500.0
LengthLimit=3.0
AllowedWeaponClass=BOMB,RCKT,RP,IRM,FT
AttachmentType=SOVIET,WP,CHINA,FRANCE
ModelNodeName=LeftPyl01
PylonMass=60
PylondragArea=0.02
LaunchRailNodeName=LeftRail01
// LaunchRailHeight=0.10
LaunchRailMass=25
FuelTankName=Tank490_MiG21
[RightWingStation2]
SystemType=WEAPON_STATION
StationID=2
StationGroupID=1
StationType=EXTERNAL
AttachmentPosition= 2.684,-1.98,-0.566
AttachmentAngles=0.0,0.0,0.0
LoadLimit=500.0
LengthLimit=3.0
AllowedWeaponClass=BOMB,RCKT,RP,IRM,FT
AttachmentType=SOVIET,WP,CHINA,FRANCE
ModelNodeName=LeftPyl02
PylonMass=60
PylondragArea=0.02
LaunchRailNodeName=LeftRail02
// LaunchRailHeight=0.10
LaunchRailMass=25
FuelTankName=Tank490_MiG21
[LeftWingStation]
SystemType=WEAPON_STATION
StationID=3
StationGroupID=2
StationType=EXTERNAL
AttachmentPosition=-1.936,-0.59,-0.566
AttachmentAngles=0.0,0.0,0.0
LoadLimit=500.0
LengthLimit=3.0
AllowedWeaponClass=BOMB,RCKT,RP,IRM
AttachmentType=SOVIET,WP,CHINA,FRANCE
ModelNodeName=LeftPyl
PylonMass=60
PylondragArea=0.02
LaunchRailNodeName=LeftRail
// LaunchRailHeight=0.10
LaunchRailMass=25
[RightWingStation]
SystemType=WEAPON_STATION
StationID=4
StationGroupID=2
StationType=EXTERNAL
AttachmentPosition=1.936,-0.59,-0.566
AttachmentAngles=0.0,0.0,0.0
LoadLimit=500.0
LengthLimit=3.0
AllowedWeaponClass=BOMB,RCKT,RP,IRM
AttachmentType=SOVIET,WP,CHINA,FRANCE
ModelNodeName=RightPyl
PylonMass=60
PylondragArea=0.02
LaunchRailNodeName=RightRail
// LaunchRailHeight=0.10
LaunchRailMass=25