The latest DHX with its slightly shorter overall length of the piggyback may fit some frame sizes. The only way you will know for sure is to fit one without any air in and gently see if it hits on full compression. The Fox Vans coil shock does fit 04 frames. I have one customer who has used one on a 19" and it did leave a little mark on the tube after a couple of jumps. I would play safe and not fit one myself.