Welcome to GTT. Check our Manuals Section for three free downloads per day. The manual should tell you the right engine. Parts are available from our sponsors for many of the Bolens. Whe you ahve questions, please include pics to make it clearer. Good Luck, Rick
Your engine is a later version of the Lauson/Tecumseh engines that were original equipment on lawn keepers. The attached file shows the various engines used on lawn keepers during their production years. During the early production years, the lawn keepers even used some Briggs and Straton engines.
All the Lauson and Tecumseh engines are the "medium frame vertical engines" which your tvm195 is an example of the last ones produced.