Hybrids Whoosh doll head on SD13 body

I don't have an SD13 body, but do have one that's a similar size. There is definitely gaping at the neck, and the head does seem a little big for the shoulder width at certain angles. It could work depending on your tastes, or if you got or made a neck donut to help with the gaping.
For Volks bodies, you might have better luck with the SD16 than the SD13.

 

I've got a couple pictures of the head on the body I have here and here. The body I have probably has wider shoulders/ arms than the SD13, since here measurements are closer to a similar sized boy body, but maybe this can help some? At least to see some of the neck gaping. I personally go back and forth on if the proportions are as bad as my initial impressions were, but the neck is definitely too big. It's also wider in the back than in the front, which I haven't seen with other dolls heads I have.

 

Glad they could help!! And good luck finding a head you like that will fit the body you have! Impldoll heads (or at last Imara) look pretty good on the same body I have, but they don't have elves, sadly. It is a little confusing with Meng, because I think they list the Impldoll body for her, so you'd think they'd be the same size, but she is bigger (and the Impldoll body I think has larger measurements in the shoulders than the SD13).