These inspection caps are a beautiful, and simple upgrade to the stock inspection caps! 
Each inspection cap includes a new O-Ring. 

Fits:

• Honda Shadow VT600 VLX Steed 1988-2007
• Honda Shadow VT750 ACE 1998-2003
• Honda Shadow VT750DC Spirit  2001-2007

Installation: You will need a 10mm allen key to remove and install these parts. Once your old inspection caps have been removed, put a thin coating of molybdenum disulfide grease or oil (MoS2) on the threads and the o-ring of the new inspection caps before threading in. Lucas makes a decent semi-synthetic assembly lube which will do the trick. This prevents the threads from galling and getting stuck,  and prevents the o-ring from binding and kinking when being threaded into the case. A kinked O-ring can result in oil leaks from the left side crankcase cover.  Bear in mind, brass is a softer material so be careful not to cross-thread the caps on installation.  
DO NOT use anti-seize or loctite.