Used motors or new replacements from a vendor are your options.
as for the relay it is a DPDT, double pole double throw. While it is a dimensionally large relay there is no need it cannot be replaced with a smaller more modern DPDT relay.
here is one currently on eBay that would work just fine, and has the added bonus of incorporating two mounting points which most relays do not offer.
even a used OEM headlight relay will cost $30-$80 when you can find one. Personally, if I was to find the OEM relay was actually needing replacement, I would upgrade to something newer, smaller and cheaper.
but, before doing that I would certainly remove the relay cover and gently polish the contacts. That step is often all that is needed.
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