It'll have a standard oil burner in it, eg Riello, Sterling, EOGB, etc and parts are available countrywide you just need to find the part number and go to a central heating/plumbing parts counter and ask. Or even take the part off and take it to the store with you.
BTW there is no 'ignitor' on an oil burner but what you may need is an electrode or ignition transformer or maybe a control box.
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