Sometimes even the volume of a RACO 175 junction box isn't enough to complete wiring or to provide space to fit the block of a driver for surface mount LED lighting . Add then, a RACO 128 extension ring.
Here is a job photo album, where box extensions were employed:
Damascus Attic, Lights Below
This is free sharing of discoveries in matters of methods, materials and policies for energy conservation in our homes. Discoveries are mainly in work I do with business Phillip Norman Attic Access, in metro Portland, Oregon. Please see my web site for this work, with my contact information: https://sites.google.com/site/phillipnormanatticaccess/ I am Phillip Norman , 1-503-255-4350. Upon request I will email a printable pdf of any post, with translation and size as you wish.