Greg's is very much like mine. Mine has the hitch point for the sulky. The discharge port has a small aluminum hood over it, possibly not original. There are also bolt holes around it where something could be mounted. I'll try to get pictures later and put here and on yesterday's tractors.What style of deck do you have? I have seen both left and right discharge on the older round nose decks but i havent saw any of the newer decks like is posted above. As for the reason for the difference, i dont know myself but i noticed that most of the left discharge decks have a plate over the hole because i best guess is it blew all the grass onto the engine while mowing.
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Go to antiquetractors.com. and under garden tractor photos type in snappin turtle. The first one listed is greg in ohio and his is a left discharge. Then derek in ohio that is my collection 5 yrs ago before i sold some and added some.