The transport extinguisher boxes are most effective when mounted properly and this kit is from the box manufacturer so you can guarantee that it fits! The box can be fitted at 30 or 60 degrees

 

This will fit both the 6kg and 9kg transport boxes also known as JBFR65, HS65 and JBFR75 or HS75 - this is a KIT55

 

Fixing requires the angled vehicle mounting bracket may be needed - see options