Cybertron deluxe Optimus Prime smokestacks

[snaketales]

Hi
I received what I think is a Cybertron deluxe Optimus Prime (it was part of a group lot)... this one: http://tfwiki.net/wiki/Image:Cybertron_OptimusPrime_deluxe_toy.jpg

However it is missing the grey smokestacks/forearm guns.

Anyone who can help me procure them would be welcome

Thanks!