Salvage yards are a good place to find a few useful parts. The most obvious one should be an ignition coil. There are several different shapes and sizes of these coils. Try to find the biggest one you can, as these are normally the highest output voltage. If you are building the dual ignition coil high voltage generator it is generally a good idea to obtain two like ignition coils. Other parts that can be obtained from vehicles are normally several different types of electromechanical relays, and also some automobiles (especially newer ones) have electronic ignition, meaning that they don't use points to trigger the coil. Instead they will commonly use a large transistor, which will normally be fairly close to the ignition coil. This transistor is normally in a TO-3 case. This transistor is preferred for triggering the ignition coil in the single ignition coil high voltage generator. Here is a typical coil you can expect to find:

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