They should have washers - although there are some japanese cars apparently where xenons were fitted without them. Think the rule is there a good while - just being enforced by certain testers now. Last handbook is dated 2012.

"Where HID (High Intensity Discharge) bulbs are fitted switch on the headlights and check that cleaning devices such as headlamp
wipers or high pressure water jets are present and work. Check where possible that the headlamp levelling device is working"