The Ofna mounts will work (assuming that they are adjustable) but the bolt spacing is to far apart. You will have to drill new holes in the mount and tap them for the bolts. I also believe that the Ofna bolts are larger so you might have to widen the slots on the chassis plate.

Find a wide open spot before you try for second gear or you might end up ordering more parts. Remember the tree carnage.

rolland