I was wondering if such a thing still exists and if so who would sell them? thanks

MTF
Mounts & Adaptors (http://www.mtfservices.com)
Always worth calling them if you can't find exactly what you want - and they're very well thought of in the UK.

You can buy them from B&H:

nikon to 1/3'' adapter| B&H Photo Video (http://www.bhphotovideo.com/c/search?atclk=Category_Video&sts=ma&ci=15294&N=4294203908&Ntt=nikon+to+1%2F3%27%27+adapter&cm_sp=Filters-_-Category-_-Video)