I'm building a Astro Hog, and I ordered the tail dragger kit. You'll get a different set of Main landing gears and the tail wheel assy. I ordered mine thru Sig. Part number is RPCK255 (tail dragger wire set). Read the instruction manual very carefully. You will need to avoid certain steps in the manual, and you'll needtoput thelanding gear rib supports in a different location. Just read that manual, mine showed both conversion set ups.