[proffighter]

Bumper fitment issues are common I guess. Had myself... Here, page 2 you can see:

http://forums.pelicanparts.com/911-930-turbo-super-charging-forum/555993-help-iroc-rear-bumper-do-you-suggest-2.html

And after I had the tub made for the second time:

http://forums.pelicanparts.com/911-930-turbo-super-charging-forum/634616-another-rust-combat-21.html