39-253LB or something else?

A quick learner from NJ says:
Good morning,
I just want to verify that 39-253LB is correct.
Also do I need the replacement black retainer for the end of the long arm? How about new window bracket at end of short arm...mine has a stud with a slip ring.
Thank you.
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Bob from SWISCO responded:

Thanks for posting. This operator is definitely unusual; we don't have a type with that type of bracket at the end of the straight arm. The 39-253LB uses the 39-529 square slider, sold separately; while the 39-438B uses a rectangular track slide that comes attached to it. I am forwarding this discussion to one of my senior colleagues who is an expert in casement windows. I want to see if either of these mentioned options could work for you, or if he has any other solution. Thanks for bearing with us. 

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Dave Sr. from SWISCO responded:

Perhaps I can help. I do recognize this operator, and it's a kind that I believe is no longer available. I suggest taking a look at the 39-253LB. I think you could use this operator and the 39-529 slide. However you must first see if you can install the 39-528 track on your window sash. If you can, then I think you'll be okay. Take a look the 39-253B along with the related parts and videos.

33-016 : #8 x 1
#8 x 1" SS Installation Screw
33-016
$0.19
VIEW >
39-528 : 14-1/2
14-1/2" Casement Track, Truth
39-528
$2.84
VIEW >
39-529 : Truth Hardware Track Slider
Truth Hardware Track Slider
39-529
$0.97
VIEW >
39-376 : Truth Folding Handle with Cover
Truth Folding Handle with Cover
39-376
$10.87
VIEW >
39-545 : Truth Snap-Stud Bracket
Truth Snap-Stud Bracket
39-545
$2.60
VIEW >
39-546 : Truth Snap-Stud Bracket
Truth Snap-Stud Bracket
39-546
$2.60
VIEW >
39-253LB : Encore Dual Arm Operator, Sill Mount
Encore Dual Arm Operator, Sill Mount
39-253LB
$29.70
VIEW >
39-563 : Encore Operator Gasket
Encore Operator Gasket
39-563
$1.06
VIEW >
39-438B : Encore Dual Arm Operator, Sill Mount, Low Profile
Encore Dual Arm Operator, Sill Mount, Low Profile
39-438B
$32.88
VIEW >
39-452 : Truth Operator Cover and Handle
Truth Operator Cover and Handle
39-452
$11.70
VIEW >
How to Orient a Dual-Arm Operator
How to Orient a Dual-Arm Operator
VIDEO
WATCH >
Comparing the 39-253LB & 39-438B Operators
Comparing the 39-253LB & 39-438B Operators
VIDEO
WATCH >
Anatomy of a casement window
Anatomy of a casement window
VIDEO
WATCH >
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