Just a few parts needed. G1/KO Swoop - just need the bot head off of this Alternators/Binaltech Grimlock bot head G1/KO Slag bot head G1/KO Sludge bot head G1/KO Snarl bot head Classics Sideswipe driver side door or the entire arm also need the windshield/top part that swivels to reveal the head. Classics Voyager Optimus Prime the smokestack gun Universe/Classics Silverbolt gun or crazy devy gun
I've got a Red Alert windshield if it'll work for you. It's got two screw holes that the Sideswipe one doesn't have, unfortunately.
I've actually got the same exact part already, it's a last resort for me, along with the drivers side arm.