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The 017As were replaced with 002As on TO&Es.The 016 wiki: MEP-016 Info - Steel Soldiers::Military Vehicles Supersite
has info on the suffixes for 016s. As were made to Ds when the motor was changed to Diesel. I don' t think the 017s had a readily available, off the shelf, cost effective Diesel option. Yanmar 7 and 10 HP motors are relatively cheap and easy to get. A 15-20 horse Diesel would probably have to be twin cylinder, heavy, and expensive making 017 conversions unlikely.
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