The heater core is not going to be that easy to find by application. You will probably have to remove it, and take it with you to the auto parts store.
And yes, it can be bypassed. In fact there is even a kit to perform this now. You will need to know if both heater hoses are the same diameter or not, and the auto parts store will be able to furnish you with a double-ended fitting and two hose clamps. Pull off the hoses from the core, and put one hose on each end of the fitting, install the clamps, tighten them, and check for leaks after topping off the coolant.
Meddle not in the affairs of dragons, for you are crunchy, and taste good with ketchup.