A few days ago I was looking for something unrelated and came across
this document (a bit old) that may help you. This one is canceled,
but it may help lead you to the current procedure.

The document: 8130.15 dated 09/14/1979
Airworthiness Certification of "Prematurely" Exported Gliders

http://www.airweb.faa.gov/Regulatory...gh light=8130


You might also try a google search like:
convert type certificate experimental site:faa.gov