This is a Summit Racing 380457-SH.  See the Summit Racing site for details.  I bought this for a Vortec conversion for my Toyota FJ62, but decided to make my own with the help of my son’s CAD skills.  Never bothered to return it to Summit, it’s been sitting in the rafters in my garage for several years.  It’s in PERFECT condition.  Never used, I unpacked it an put it right back in the box.