broken patio door handle needs replacement

The handle base has bent and torn probably from being slammed too often. It no longer locks. I am trying to find a replacement. The door was purchased in 1999 from West Coast Plumbing in Arcata, CA, whose owner, Tom Hopkins, recommended asking you for help. The patio doors were made by Insulate Doors, no longer in business.

The handle is stamped "Reflectolite Prod Inc. patent pending 2800-03"

Photos attached of the broken handle, its attachment points on inside door frame (4" between screws), an intact handle from another door (~8.5" long), the outside handle (~7.25" long).

Thank you for any advise you can give me.

Sydney