Hmmm… BuNo 160998

It came off the assembly line in 1978, and was the 4th A-6E built from the start with the TRAM* upgrade (160995 was the first).

http://www.joebaugher.com/

160993/160998 Grumman A-6E Intruder
c/n I-594/599
160995 (c/n I-596) in storage at Naval Air Depot, NAS North Island, CA. Noted in compound
behind restoration hangar at Yanks Air Museum, Chino, CA Nov 2002
160996 (VA-35) crashed into sea Nov 18, 1981 after undercarriage
collapsed aboard USS Nimitz. Both crew ejected safely.
160997 to AMARC as 5A0151 Feb 8, 1995. SOC Mar 16, 1999.
160998 to AMARC as 5A0222 Sep 5, 1996. SOC Jun 14, 2002.

* TRAM = Target Recognition Attack Multisensor. This is the AN/AAS-33A Detecting and Ranging Set, a FLIR/Laser weapons guidance system.

It is housed in a round turret under the nose forward of the nose landing gear.

Make sure yours has this, for completeness. 😉