This is the rear mounting plate for the DLE 170M twin, a large-displacement two-stroke petrol twin for very large scale models.
The part itself is the rear mounting plate, which carries the rear of the engine to the airframe mount.
Why it is replaced: replaced when cracked or when the bolt holes have elongated, which lets the engine twist under thrust.
Fitting note: Check flatness and inspect for cracks radiating from the bolt holes.
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