Macross II just model kits only VF-2SS.
This being the toy section maybe this isn't worth mentioning but there are more Macross II model kits out there then just the VF-2SS.
B-Club has done the VF-2JA (both Battroid and Fighter), the Gilgamesh, and the Metal Siren. Have a look here:
http://www.macrossworld.com/macross/models/b-club/b-club.htm
Also if you get the Musasiya VF-2SS, it comes with 3 Zentradi pods.
It's been a while since I've watched Macross II so I'm not sure what the "Red alien mecha" is you are refering to at the moment.
Carl
Thanks! The red alien mecha I was talking about was the "Gilgamesh" mecha. Nice to see that they at least made a model of it cause when I was searching I didnt come across anything Macross II related.