Spectrum SA-550

The Basler Turbo 37/Spectrum SA-550 is a twin-boom single engined aircraft converted from a Reims/Cessna FTB337G Skymaster by Basler Turbo Conversions and Spectrum Aircraft Corporation. The aircraft first flew on 1 February 1983.
Design and development.
The Skymaster rear engine was replaced with a flat-rated Pratt & Whitney Canada PT6 and front engine was removed and the cockpit was stretched forward. The aircraft is capable of taking off in less than fully loaded. Basler had a deal with the government of Thailand to convert their O-2 Skymaster to SA-550 and to convert civilian Skymaster in Thailand as well. These plans appear to have never happened.
The aircraft is currently owned by Basler Turbo Conversions of Oshkosh, Wisconsin.