Without going to look I can't put my finger on what it is, but there is a difference in the frames between the 1X6/7's and the 1X4/5's.
The 1X6/7's have that extra bracket for the 3pt. hitch that the others don't have. The 1X6/7's may just use that bracket because the tunnel doesn't go all the way to the back of the frame to make room for the "hole" under the seat.
I don't know if that alone will cause problems putting the 1X4/5 fenders and seat on the 1X6/7 frame or not.
Good luck, keep us posted as to how it works out.
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