For the projo, the diameter is identified as 290mm. I don't have a lot of faith in some of these photos and measurements, however. They came from some projects that took place over several years. Many of the early ones were terrible, poor photos, poor resolution, poor identification info. Thankfully they improved greatly as time went on, they photo resolution improved, as did the quality of the photography itself. The painted markings on the rocket are APG, for Aberdeen Proving Ground. I have no doubt that they "borrowed" design features to test and try for their own purposes.