Spark plug snapped off in the head of my 93 honda d15b7 1.5 liter engine how do I fix without replacing the heads

I have a 93 honda with a spark plug busted off in the heads I need to know how many liters the engine is so I can get a new head or possibly just a gasket if I can get it out without damaging the head

Need to know what size so I can get a head or headgasket kit or does that even matter

A D15B7 engine is 1.5L.

The engine no. is cast into the block, which is located to the left of the exhaust manifold and below the radiator hose, as you face the engine.

Depending upon the situation, soak the plug with PB Blaster or Kroil. Try using a long "Easy Out," attached to a 12-point socket, and a 12-inch breaker bar to remove the plug. Gently work the plug and keep applying PB Blaster or Kroil.

In the future, it's important to remove spark plugs every 3 years to help prevent seizure in an aluminum head. Using a flux brush, lightly coat the spark plug threads with antiseize compound. Afterwards, since antiseize is a lubricant, tighten the plugs 25% less than the spec to prevent stripping the threads or plug seizure. Only install/remove spark plugs when the engine is "stone" cold.