I believe the MSP oil cooler to be overrated. i already have a supplemental oil cooler that I will likely be installing this spring to keep the oil temps down. I believe you need an oil cooler, but the MSP one is somewhat useless.
Consider that the thermostat on the MSP is designed to be open at 180 degrees F, and often times in traffic at idle the water temp will hit 210F (digital gauges, reading the ECU).
Consider also that the normal running oil temp in summer is 200-210F (analogue gauge reading oil temp at the relocated filter). According to several studies I've read, optimal oil temp is 180 degrees for both synth and non-synth oil, synth is able to handle the higher temps better without breaking down. (perma-cool website). What marginal benefit will running hot coolant maybe 10-15 degrees cooler than the oil do to remove heat from the oil? My conclusion based on my gauge readings, is that the temps are so close that there is no point to having a water cooled oil cooler.
So, before you go and source the part and the longer bolt to make it work, and expend the effort, think about what difference it will make and how you might better spend your money. BTW I bought the perma-cool filter relocation and oil cooler kit almost 2 years ago, but haven't yet installed the cooler. *shame on me*...