Ni 9977 c series filler module for empty slot used on nsn 7025-01-581-2458.
No other part numbers with same form, fit, and function found.
NSN 5905-00-242-2447
NSN 6320-01-247-0898
NSN 6240-00-152-6289
NSN 5935-01-094-5949
NSN 5935-01-607-0770
NSN 6645-01-633-1852
NSN 5915-00-115-3635
NSN 5930-01-132-6580
NSN 7035-01-027-2259
NSN 6135-00-660-8654
NSN 5855-01-157-7186
NSN 2925-01-197-7864