Yes you can, you will need the posi unit though and some 55/56 you can do it with no mods but on the 57 there is a gusset that you need to grind down, or if that gusset is in the one your trying to do it will have to come out some, if you need some pics let me know and when I get home I'll post them
most of the pumpkins from 55 to 64 I think are the same
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