Side views of the OP-2E neptune can be seen at http://p2vneptune.org/c05.shtml . All 12 of the Squadrons aircraft looked the same except for the BU/NO and the MR ID number 1-12. MR stood for Mud River.
A picture of MR-2 ( BU/NO 131436 ) can be seen on this site under aircraft pictures. Hope this helps.