Installed the oil cooler on the aft side of the left engine baffle. Three 3.5" spacers are used, two on the left side of the cooler, one on the right. For the right side long bolt, a 9/32" spacer is required to ensure the bolt does not contact the cylinder passing through the nut plate.
I had to re-route a bit the 3-wire shielded circuits for the pressure manifold for fuel, vacuum and oil pressure to ensure the oil line does contact. I am actually more pleased with this routing in general.