"Is that rod replaceable?"

Sure. It takes 5 minutes to disassemble the door panel and 5 seconds to unclip this linkage.

"...if so does anyone know where to get it?"

From a junk. Probably $0. You can use this part from any '77 to '93 240, more or less. I probably have a half dozen in my backyard waiting to go to the boneyard.

"...to fit on it b/c it's too big for it..."

Which "it" is too big to fit the other "it?" Toooo many its here....