What kind do you currently have?
If it's a splined one you need to remove it so see what's printed on the bottom bracket shell....
If you use outboard bearings it's the standard one 68-73mm english threaded.
Your frame's bb shell is 68mm wide but with the e-type fd it'll be 73.
"Common sense isn't always that common!"
Custom Prophet and Custom Delta V
When I replaced mine, it needed the spacers. 2 were required on the drive side. However, the etype FD will take the place of one. I used an XT M770. It worked great. Follow the instructions!! My XT BB had the set up for an etype FD like on the Prophet.
An important note,
Grease the threads of the BB at a minimum. I use teflon tape and plumbers pipe dope so I have no creaking. Creaks really, really, bug me. I'm a little overboard, so grease may work for you.
Lead by my Lefty............... right down the trail, no brakes.