replacement part for casement window truth entry gaurd operator

A home owner from Woodbine,Iowa 51579 says:
base with worm gear 40372
short arm is 20810A
connecting arm 31538


WHAT IS THE REPLACEMENT PART NEEDED?
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Emily from SWISCO responded:

Hi there!

The numbers you gave are often associated with our 39-031 & 39-032 and 39-155 & 39-156 operators. I can't promise these are what you need without pictures, but look these over and compare our dimensions to yours to see what you think. 

39-031 : EntryGard Dual Arm Operator
EntryGard Dual Arm Operator
39-031
$28.28
VIEW >
39-032 : EntryGard Dual Arm Operator
EntryGard Dual Arm Operator
39-032
$28.28
VIEW >
39-035 : Truth Hardware Entrygard Dyad Window Operator
Truth Hardware Entrygard Dyad Window Operator
39-035
$30.82
VIEW >
39-155 : Caradco Window Crank, 9-1/2
Caradco Window Crank, 9-1/2"
39-155
$28.23
VIEW >
39-156 : Caradco Window Crank, 9-1/2
Caradco Window Crank, 9-1/2"
39-156
$28.23
VIEW >
Connecting a casement window operator to stud bracket
Connecting a casement window operator to stud bracket
VIDEO
WATCH >
Watch How To Repair A Casement Window Crank Operator
Watch How To Repair A Casement Window Crank Operator
VIDEO
WATCH >
How to Orient a Dual-Arm Operator
How to Orient a Dual-Arm Operator
VIDEO
WATCH >
Anatomy of a casement window
Anatomy of a casement window
VIDEO
WATCH >
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