Here you will find a list of part numbers for stock and after market Air and Oil filters, and spark plugs from various manufacturers for the Honda Shadow VLX motorcycles.
Yuasa Top Quality Lead Acid YTX9-BS Battery:
Each generation of VLX has its own air filter:
Stock Air Filter - First Gen (1988 to 1998): 17205-mr1-000
Stock Air Filter - Second Gen (1999 to 2007): 17205-MZ8-G20
K&N Replacement Air Filter: HA-6088 (1988-1998 on left) and HA-6199 (1999-2007 on right)
K&N Oil filter: KN-303
K&N Chrome: KN-303C
Note that the VLX utilizes the same oil filter as many other Honda Shadow models including the ACE 750 and Spirit 750. Here is a list of aftermarket oil filters that fit the VLX often available localally.
Napa Gold: 1358
AC Delco: PF2123
Purolator Pure One: PL14612