Welcome to one of the most challenging, frustrating, yet rewarding quests, SuperFighter!
You might want to start out easy and snap up one of those Turbo Fighters that they have at Wal-Mart. They are starting to get scarce, but should still be available at their modest $15 price tag or less.
Finding Cybotronix bots in general is a game of pure chance. I managed to find most of mine on E-bay over a very long period of time.
Most of my Cybotronix collection were obtained MISB, but one or two of the 8 inch bots I have were gotten second hand and were missing parts. What I did was printed pages from Hap-P-Kid's web site of those models, and with a marker, indicated which weapons and bits of armor were missing, then sent that with a nice polite letter to the address in China.
After a long while at which point I'd forgotten all about it, a box came from China!
Not only did they send the parts requested, but threw in a few more, and best of all, they sent me a MISB 8' Thunder Warrior robot! I was totally blown away!
Now this was a while ago, and I can't guarantee that you'll get any freebee bots, but writing to them in this fashion with a very clear indication of what bots you have and what parts you need may very well get you the needed parts. You probably will want to specify color too. It might not hurt to ask for a current catalog too; I used one they had previously sent me as a guide for my search.
Now for you parts:
The first bot on the left in your photo is a Super Fighter MK 2. The one on far right is the same model, only in blue. You need exactly the same parts for both.
These are:
* Both fore-arm armors
* Both lower leg armors
* Two shoulder mounted missile launchers
* Two missiles
* Laser pistol
* Riot shield
The middle bot is a Super Fighter MK 1 version 1 (V2 had a different head mold).
You need:
* Both shoulder armors
* Both fore-arm armors
* Chest armor
* Both lower leg armors
* Two shoulder launchers
* Two missiles
* Large shield for the left hand.
Hope that helps!