4c/o 1 retainer,p/n 3150260-137-81and 2 pads,p/n3150260-137-89;retainer is made from 0.063 in tk alum alloy 6061,per mil spec qq-a-250/11-t6,treatedw/chemical film per mil-c-5541/class 1a,primed per tt-p-1727,painted w/2 coats per tt-e-527;retainer is 3.500 in lg,0.820 in w w/o arms,2.10 in w/arms;arms are 0.500 in w ea,accommodates belt take-up spool;ea pad is 1.000 in lgx 0.500 in w x 0.125 in thk,strip-n-stick variety,cohrlastic silicon sponge rubber;2 mtg holes,oblong,0.250 in wi x 0.40 in lg