It's possible you're thinking of another component, or there may be a specific application of the D1105 where an additional filler is used.
To clarify, please provide more context about the situation you're referencing. For instance:
* What specific model of equipment does this engine power?
* Are you looking at the engine itself or a specific component?
* Can you provide a picture or a diagram of the area you're referring to?
With more information, I can help you better understand the purpose of the fillers you're seeing.
