I read on Angel Den that the SD17 Williams head was sculpted to better fit the SD17 body. Does that mean it won't fit the SD13 body anymore? Does anyone know what the SD17 head looks like on an SD13 boy body? Is he still a good fit or is he now a bobble-head? Also, does anyone know what the physical differences are between them? It looks to me like SD17 lost some of his youthful angst and replaced it with sullen melancholy. ~laughs~ I just can't put my finger on exactly what features were changed, though.