Legends class Prime has a slot on the top of his truck mode (I assume it's his back in robot mode). Legends Jetfire has a (seemingly) corresponding peg on top of his vehicle mode.

http://www.tfw2005.com/boards/transf...ml#post2563065

Quote Originally Posted by Autocon View Post
maybe springer is just a repaint like they did with cliffumper

which means incinerator will be remolded just like the others perhaps?
coz he might be in the movie they gave him hands!
Unlikely. Springer's design has a different transformation (bearing in mind Incinerator had a very simple design). If he is an on-screen character, then Incinerator was the basic template which they would expand upon.