Flanged 31 spline axle axles have 3.15" bearings installed. axle housing only is 50" wide from housing end to housing end without axles. axles have three bolt patterns in all axles, 5 x 4.5" small ford, 5 x 4.75" GM and 5 x 5".
NEW 55" wide Ford 9 Inch Round Back Rear End Housing Kit with 31 spline axles
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Ford 9 inch 60 inch HD New Smooth Back Rear End Housing Kit with 31 spline axles
ARP 250-3020 - 9" Pinion Support Stud Kit Blk For Ford 9 Inch 3/8-16 3/8-24