that si the Alum OD truck Tranny I often use , it has botht the front & rear shift mount pads althougu usually the rear pad needs to be drilled & tapped
you can easily trim the front brg reatiner down to 4.80 & get a belhousing to match , the OD should be .71 , the A body short shaft version was .73 od
looks like a deecnt deal