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Wood Ultimate Casement (WUCA) special size stile and rail information is below:
 
STANDARD STILE/RAIL DIMENSIONS
Bottom Rail:StandardMinMax
WUCA2 1/16"                3 9/16" (TALL)1 15/168"
WUCAP1 15/168"
WUPCA1 15/168"
WUPCAP1 15/168"
Top Rail:   
WUCA2 1/16"1  15/168"
WUCAP2 1/16"1 15/168"
WUPCA2 1/16"1 15/168"
WUPCAP2 1/16"1 15/168"
Stiles   
WUCA2 1/16" 1 15/168"
WUCAP2 1/16"1 15/168"
WUPCA2 1/16"1 15/168"
WUPCAP2 1/16"1 15/168"

For more information, see:
Casement Windows