These are the replacements for the old Marvin Integrity Casement Window Split Arm Operators (AS SHOWN) - Come standard in the STANDARD WHITE FINISH - or Bronze or Gold. SPLIT ARM OPERATORS - for your old Integrity casement window units - preferred mounting hole configurations, operator stampings may include 45261, 30905, 45035, 40351, 40352, TH24174, TH24175, TH24176, and TH24177, 30710, 20544, 20810, 30471, 30636 - Replaces the TH/24018, TH/24019, TH/24020 and TH/24021.

Marvin Case-Master Egress Style, Dual Arm Roto−Gear Operator as Outlined Below. 

CN 48* through CN 56 width for sash with daylight opening width of 18 1/2 (470) through 22 1/2" 

Marvin Casemaster | Ultimate Casement Window Collection - Hinge Arm Parts

Hinge Arm - (All Push Out units and Crank Casement)
UL/LR = Upper Left / Lower Right
LL/UR = Lower Left / Upper Right
Frame width sizes: 18" arms 

UCA/UPCA= 20" (508)−23 63/64" (609)
UPFCA= 40" (1016) − 47 63/34" (1219)
22" arms
UCA/UPCA= 24" (610) and wider
UPFCA= 48" (1219) and wider.
Includes:
Hinge Arm