hi all just new to this could anyone tell me wether the rear bumper plastics on a 04 doblo are a different length to a 07 doblo any help would be great thankyou.

I can't say for sure. If the 07 is a facelift doblo (which is should be - more angular front lights, front fog lights low in front bumper, more rounded rear light cluster) and the 04 is not, then it's likely that some of the rear plastic moldings will be a different shape as the rear end has a different apperance.

I've attached some pictures from google images to show the difference. The blue doblo is the older shape.