Found Scan of the Estes Sizzler (1906) instructions with the PNC-50YR nosecone.

[K'Tesh]

Estes site doesn't have any version of the 1906 kit on it. JimZ's site, and P.RS.C's database preserves the version with the one piece, blow molded, PNC-50Y nosecone, but not the later two piece, injection molded, PNC-50YR nosecone. I'm trying to record the later version.

Here's a photo of the version, with the nosecone (Source: Worthpoint)



All of the samples I have available to me are of the Y version.