Truth Encore dual arm operation

A quick learner from Pleasanton California says:
August 3, 2021
Hello,
I'm looking for replacement for my broken operators. I need both left and right operator. I narrowed down to two products that looks similar to mine. 39-438B sill mount low profile vs 39-253LB sill mount. I attached pictures to help you help me identify which one. Both show out of stock unfortunately. Please let me know. Thank you.

Best Regards,
-Hengky
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Casey from SWISCO responded:
August 6, 2021

Hello,

The main difference between these two operators is the slide attachment. Yours is the 39-529, which is used for the 39-253LB and 39-253RB. Thanks for posting! 
Encore Dual Arm Operator, Sill Mount
Encore Dual Arm Operator, Sill Mount
39-253LB
$30.70
Encore Dual Arm Operator, Sill Mount
Encore Dual Arm Operator, Sill Mount
39-253RB
$30.70
Truth Hardware Track Slider
Truth Hardware Track Slider
39-529
$1.20
How to Orient a Dual-Arm Operator
How to Orient a Dual-Arm Operator
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Comparing the 39-253LB & 39-438B Operators
Comparing the 39-253LB & 39-438B Operators
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