hey guys, i just picked up a sleeved gsr block but its bare besides main caps
i came across this hole which i know is for the oil cooler, but im not running an oil cooler
i know that 96 and up b18c1's came with it just plugged off




so what i am asking is either what thread this is, or what the part number for the oem plug is because i cannot find it on the diagrams on acuraoemparts.com

input is appreciated, thank you!