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Thanks for posting. I believe this is the 39-333 Dual-Arm Operator, with the extra-short link arm. See if the dimensions below match what you have.

Dimensions for 39-333

For a new cover and handle that work with this operator, see the 39-107 and 39-114L. For a track that the straight arm slides along, see if the 39-505 matches what you have. Let me know if you have further questions. 

Hello,

Please see the 39-505 track for a compatible style. Let us know if you have any additional questions!