Yes, you would use an Elk keypad. Some people have keypads they already like, or just want a wireless one so I wanted to make sure you knew to use an Elk keypad.
And an EOL is an End Of Line resistor and is typically used to make the zone/circuit not suceptible to short circuits, either deliberate or accidental. Most cheap panel require them and installers put the resitor at the panel instead of at the 'End Of Line' by the contact - where they belong. It's easy to check - when you disconnect your zone wires, measure the resistance, it will either be open, shorted or some value like 1,2, or 3kohm. If its open or shorted you should be fine. If it reads 1 or 3 kohm or something other than around 2k, then you need to do something. Search for EOL using the Google search in the Search screen for more info.