Thanks! Please let me know when you found (and tested) the Dean Markleys.
I usually play flatwounds on my Rics, but now have the original Rickenbacker rounds (they are still new, removed them right after I got tha bass) on my 4003. I don't like rounds but the sound is cool, anyway.

Next I'll try D'Addario 170EXL on one of my 4004's.