Michelle Rodriguez Says Scott Eastwood Is No Paul Walker

Michelle Rodriguez could not be clearer ... no one can fill Paul Walker's shoes in the 8th 'Fast & Furious' flick ... not even Scott Eastwood.

Eastwood's onboard for the new flick, along with Charlize Theron ... but Michelle bristled at LAX Wednesday .... Scott's a cool dude, but Paul was simply irreplaceable.

Walker's death is still a touchy subject for Michelle, who recently confessed she was sad she didn't die before her beloved co-star.