Cres, ams 5616, comp 615; 3.360 in. Min and 3.380 in. Max lg; mtg flange 1.537 in. Sq; four mtg holes in flange 0.276 in. Min and 0.286 in. Max dia; four holes perpendicular to axis; 0.249 in. Min and 0.251 in. Max diameter hole through axis; both ends counterbored