Rush Manufactured, Pat date 1924.
I have found these mounted in base of Mae West 17's & 117's. All I have seen mounted on outside had mounting lugs on back casting, unlike what you just got w/ lugs on front casting.
Even through my 17 has a different outside bracket, you can see in refection that lugs are on back.

You might get lucky by wobbling out the holes for mounting.

Mae West Pump unit.jpg
Last edited by Dick Bennett; Thu Mar 03 2011 04:19 PM.