This is a 2004 Roadking. The airfilter element is off the Arlen Ness backing plate, to clean and reoil.
Under your bike are two drain plugs. The one facing DOWN and farther to the rear, is the TRANS drain plug. The one facing FORWARD on the pan, and closest to the engine, is the ENGINE drain plug. Both are 5/8".
Run engine for about 2-3 minutes. You want to make sure the crankcase is empty and most of the oil is in the pan, and not in your crankcase. Warm oil drains faster then cold oil as well.
Trans drain bolt: (pointing to with black, gloved finger, on right side, at frame)
Engine drain bolt:
Note** That's also on the left side of the bike, closer to the primary.
Using a suitable, low-sided pan, drain the oil. When finished, wipe the magnetic plug off and take note of any dibris, if any. There should be nothing more then small, "fuzzies". Anything more, and something's not good in the world....
Note O-ring on plug
. Rule of thumb: If you don't have a new one, your old one will tear. No need to replace a good O-ring, but if it's torn or cut in any way, replace it. If you don't have a replacement, the gremlins will tear the one you have, and leave you hanging. Murphy's law.