using applescript to launch a automator action

I am using proppercropper.action to crop a photo that is part of a larger script.
I can’t find dictionary support for the automator actions. I assume you can just execute it in automator but I have 4 inputs that are necessary in the action.
This is what I have tried.

tell application "Automator"
	set pixelist to {100, 206, 154, 146}
	execute "Nautilus HD:system:library:Automator:proppercropper.action"
end tell

I’m not sure how to get the list into the action.
any idea’s?