Greg, I'd say Hella 1st, then Sylvania #2 (also found on USA bound 914s & usually what the dealers here sold for replacements).
You probably won't need to worry much on that even at Parade though, since they're considered wear items like tires, & most would likely have been replaced at least once by now.
PS - To be absolutely correct you'd be incandescent sealed beam, since US-DOT then still had the bugaboo about Halogen headlights, but many swapped out to H4s for better lighting. Today you can get the H4 non-sealed, sealed Halogen, or sealed replacement & upgraded high power brighter ones from Hella/Sylvania without being gigged anywhere but AACA/CCCA/etc. shows, & probably not even there!
Tom
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