HWB2-28RA21
GANZ HWB2-28RA21 PRO PAK/OUTDOOR HOUSING KIT HWB-2
You will find that 1/4 in is a common denominator in most projects.
Cbc HWB2-28RA21 Pro-pak Indoor/Outdoor Housing Kit w/ Wall Mount
A nice touch with Carbon Conversions is the smooth finish they achieve on every part.