Photos to help with Trencher attachment plate assembly 
Tooth Counts:
Tungsten Left: 6
ET-44-2001
Tungsten Right: 6
ET-44-2003
Tungsten Center: 12
ET-44-2002
Earth Left: 8
ET-44-2010
Earth Right: 8
ET-44-2011
Tooth Hardware:
Trencher Gear Oil as Recommended: 
Mobil Gear 600XP (or equivalent)  Equivalent recommended 90 Weight Gear Oil. 
See attachment for MT-48 parts diagram