My part matches your measurements from your piece in the website. Could you please let me know if your part it would work. A number in the short arm is 31876 and the long arm is 41011.
Thanks
Jorge
Casey from SWISCO responded:
October 12, 2021
Hello,
As long as the specifications on our product pages match up to yours, your operator looks like a match to our 39-253LB and 39-253RB Encore operators, which use the 39-529 track slider. Thanks for posting!