Old Style Original Casement Window Operators and Roto-Gear Units, Cranks and Handles for 1970s - 2000s replacement parts, Model # CLN2FPIRH/LH - Right or Left Handing Models (see pictures below). 

IN THE COMMENT SECTION @ CHECKOUT - Specify Handing - If Not Specified We Ship LEFT HANDING -- This is the new replacement model for those old BF-Rich and other older Casement Crank Operator Units used for a number of years. 

SEE PICTURES BELOW .. "handing" and "B" Arm Length. These are the 4 7/16" (B) Arm Length. If you need the shorter lengths you must specify in the comment section at checkout.