You can get a Davis Diesel Development conversion head for most any glow engine.
The larger engines with a smaller bore carb work the best for diesel conversions. But folks have been putting the heads on just about anything with success. One thing is if the engine has a large bore casrb, you can't run really large props as the engine can't draw fuel well with a big bore venturi in the carb. But you can run smaller props really good though.