gap

Can any LCR owners help me out? I have just had a new rear bumper put on as some goon crunched it. Now the gap between the top of the tailpipe and the bottom of the cutout looks much bigger. What should the gap be and is there anyway of adjusting the back box to suit? Did a search but couldn't...

are the gaps for a 1.4 on spakr plugs all the same? from what i have seen it depends on the engine code but can be 0.8mm or 1.0mm, is this correct?