Casey from SWISCO responded:
March 20, 2023
Hello, It's tough to be sure with your operator still installed but I would recommend starting by comparing the specifications of the 39-326 Roto assembly to yours. I'll include the dimensions from our product page below. Take note that the downward-facing peg attaches to the 39-534 mounting bracket, which is not visible in your photo. Thanks for posting! Dimensions for 39-326
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