I just installed a 6 row horizontal low mount oil cooler from Jagg on my Road King. You can see the unit
here.
I really like the looks of the horizontal cooler and it doesn't interfere with my removable leather lowers. It wouldn't interfere with hard lowers on a decker either.
Another nice feature is that it is a thermostatically controlled unit, which doesn't cool the oil until 195 degrees. This is much more convenient than blocking off the cooler with cardboard and rubber bands when the temps drop in my opinion.
We have had record temps here the past few days and the drop in engine heat has been quite noticeable with the new oil cooler in place. Jagg gets a thumbs up from me.
SM