The 1991 catalog page is available at Ninfinger. You might fall foul of the Estes renumbering issues; going from 2040 to 2055 and thence the number being reused for the BLU-97B. The catalog calls for a total length of 22.5 inches on a 0.976 (BT-50) tube. The YORS references a PNC-50YR which can be had from Sirius Rocketry. I thnk it is about 3.6" to the shoulder. As for the fins...

http://ninfinger.org/rockets/catalo...91/91est20.html

http://www.siriusrocketry.biz/ishop...products_id=750

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