CAST ALUMINUM; SIX MIG HOLES; 0.281 IN. DIA OF MTG HOLES; 3.433 IN. O/A HEIGHTH; THREE HOLES IN CENTER OF COVER COUNTERBORED 0.220 IN. DIA BY 0.030 IN. DEEP AND TAPPED 10-24 UNC-2B THD; 0.470 IN. DEPTH OF TAPPED THD; ONE HOLE TAPPED 1/4-20 UNC-2B THD BY 0.540 IN. DEEP; 1.750 IN. C TO C BETWEEN MTG HOLES AT TOP; 2.570 IN. C TO C BETWEEN MTG HOLES AT BOTTOM