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Side SAPI (SSAPI, S-SAPI) torso side plates are only in 6 in × 8 in (150 mm × 200 mm) size, and weigh around 1 kg (2.2 lb). [13] The replacement for the S-SAPI in U.S. Army, the Enhanced Side Ballistic Inserts (ESBI, E-SBI), originally had only the 7 in × 8 in (180 mm × 200 mm) size, Small and medium were added later on. [14]
As a stop-gap, some were developed over a period of 28 days, using old 8 inch (203 mm) artillery barrels as casings. These bombs weighed over two tons but carried only 647 lb (293 kg) of high explosive. They were laser-guided and were designated "Guided Bomb Unit-28 ". It was proven effective for the intended role. [12]