I spent some time this weekend trying to figure out the rear seat bast in the MK1 UC. I also got what I feel is reasonably close to the orginal. I may be off in some of the details/ dimensions but with no known origianls its rather hard to make an exact copy.
First up is this drawing from a manual showing the rear seat components. The complete drawing was posted on this thread.
http://www.mapleleafup.org/forums/sh...highlight=seat
Notice how the drawing shows two layers of plywood with a riser between them. I scaled them out to be 2" in total height from bottom of lower plywood to top of upper plywood. This only appears to go a far forward as the cushion. My thinking on why this is there is to keep your rear end from sitting half on/off a cushion.
Notice also how the cushion comes up to the top edge of the left side metal bracket and that there is two layers to the cushion. I believe that the cushion is in fact made up of two seperate pieces and that the strap would be undone to remove one layer for the kneeling pad.