* Engine Type: Harley-Davidson makes many different Softail models, and the engines vary. You need to specify the exact model (e.g., Softail Standard, Softail Deluxe, etc.) to determine the engine type (e.g., Twin Cam 88, Twin Cam 96, etc.).
* Location: The "bottom of the engine" can be interpreted differently. Are the plugs you're referring to on the side of the engine cases, or on the bottom of the oil pan?
To help you identify the plugs, please provide:
1. The exact year and model of your Softail.
2. A description of the location and appearance of the plugs. Are they round, square, or have any identifying markings?
Once you provide this information, I can help you identify the purpose of the plugs.
However, remember that it's always a good idea to consult your Harley-Davidson owner's manual or a qualified motorcycle mechanic for accurate information.
