Peco
Code 100 Streamline Three-Way Turnout w/Medium Radius

Electrofrog
Walthers Part # 552-1907, p. 275 Walthers 2012 HO Scale Reference
HO scale, $58.99, currently in stock at Walthers

 
Nominal radius: 36" (914mm); angle: 12 degrees; length: 8-21/32" (220mm).