cessna185 is close enough with his answer.
Above photo shows the near complete unit, but alas with nothing against which to compare its size (or lack of).
As you can determine from the pic below it is a RR 250-C20R/2 (SP) [out of a MD500N].
The (SP) infers it has the Ceco fuel pump.
Originally a development from the Allison Engine Company in the early 60's. Allison was acquired by Rolls Royce in 1995.
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