What part do i use

i have a Vtail 500 and the newer controler which ESC’s do i use as one has quit. I don’t see a part number in the kits so i am lost on what part to replace it with?? any help would be great.

We see you purchased RB-Lyn-709 which included RB-May-37:
robotshop.com/en/lynxmotion- … ctors.html