Sorry I don't have a pic to post, if you have one it might make it easier to understand. I think you are referring to what would be a black, flat, disc shaped cap that covers the OEM cartridge-type oil filter on the bottom of the engine - ? You may not have one anymore. IF you have a spin-on type oil filter, then that cover is eliminated. IF that is the case, then you are the beneficiary of the PO installing one of the best mods you can get for this bike, the SPOOFAK, which is short for the Spin-On Oil Filter Adapter Kit. Designed and built by genius engineer and Connie-modder extraodinaire Dan Bergmen, sold by
www.murphskits.com. You can find a pic of it on Murph's website. Search this forum for "spin on oil filter adapter" and you'll find a lot of info. There is a list somewhere of the filters that will work with it.
If you are talking about something else, or don't yet have a SPOOFAK, consider getting one. You'll love it.