No laughter here at all,we're all here to share info.
What I have found to work well is the M1 in the engine, spectro in the trans or even redline heavy but I prefer the spectro after trying a few of them. HD
formula+ in the primary or any 10/40 oil that does not have friction modifiers in it.
There are many other good oils to use but these are what I found to work well and give satisfactory results.
In your 03 the spectro to use would be the GL1 grade which is formulated for the 5 speed trans.
Check post #11 here.
Oil Suggestions For Harleys - Harley Davidson Community (Oil Suggestions For Harleys)