Material is 96% lead, 4% antimony; 4 counterbore holes at each corner, 1.125 center from side edge, 1.625 center from end.
No other part numbers with same form, fit, and function found.
NSN 5945-01-411-2822
NSN 5920-01-129-5886
NSN 6685-00-450-0053
NSN 5910-01-366-0094
NSN 5950-01-156-5520
NSN 5915-01-068-6826
NSN 6610-01-298-5662
NSN 5975-01-333-4108
NSN 5950-00-519-1267
NSN 5945-00-741-8416
NSN 5930-01-437-5186
NSN 5915-01-225-1355