Arrggh, I'm even blocked from going to buckslowers. Anyway, there is an extruded type oil cooler instead of having fins to cool. It has external point all along the outside and it's supposed to cool very well even if not exposed to air up front. Not sure how much room is underneath the Raider to mount one of these things but maybe you'll all have better luck finding it. I'll check in my room to see if I book marked it there. One guy was taking a hammer to it to try and show how stout it is. Supposedly used in aviation and this guy started marketing it for H-D's.
When I search I come up with this but I was thinking there was a more cost effective system out there. I can't see the videos on this site but maybe they have the video I was talking about with the hammer thing. He might have other sources to come up with a simpler solution.http://harleyoilcoolers.com/oilcoolerkit.html
Yep, the oil bud is what I was thinkin about. Oil coolers aren't as cheap these days and these jump right to the top. Good idea if you don't want to see it but $$$