I've found a source for the white headlight sockets. Going to structure this thread just like my other thread on the neutral/reverse dash light socket thread. I also have a few sources for the 350x style headlights, the ones with the dust boots are pretty pricey though.
I should have up to 87 covered for all Honda models with headlights. Wouldn't mind to dive into the other brands some time too. Might have to use find on page to find your machine.
Headlight socket style:
White plastic style - I'll add a photos later, but it's the type that the bulb goes into the socket, then the socket twist locks into the back of the headlamp.
350x style - 3 prong socket that twist locks into the back of the head lamp, bulb base has one locator nub and is sandwitched between the socket and headlamp. This has two contacts at the bulb base for bright + dims.
H4 - common motorcycle style headlight, there's no socket to this one, the bulb also is where the connector plugs into it. Bulb clamps into the back of the head lamp.
Sealed beam - bulb and headlamp are all one unit, the whole thing has to be replaced when the bulb burns out.
Parts based on part numbers. Bold = I have enough info to mod/reproduce the part.
350x style sockets
33130-051-690 (350x style) - in production still
- ATC70
- ATC70K1
- ATC90
- ATC90K1
- ATC90K2
- ATC90K3
- 76-78 ATC90
33130-943-003 (350x style) - 3ww Shop
- 79-80 ATC110
33130-HA5-003 (350x style) - 3ww Shop
- 85-86 ATC350X
White Plastic Style
33130-958-013 (White plastic style)
- 81-82 ATC110
- 81-83 ATC185S
- 81-83 ATC200
- 82-83 ATC200E
- 84 ATC200ES
- 84-85 ATC200M
33130-943-013 (White plastic style) - should have this on the 84 & 85 ATC125M parts machines I have
- 83-85 ATC110
- 84-85 ATC125M
- 84-86 ATC200S
- 85-86 TRX125
Others
33130-292-033 (odd one, not sure if this is the white plastic style? partzilla has it linked to the whole light assembly which might use a different socket type) - in production as a full assembly
- 80 ATC185
33130-HB6-000 (similar to white plastic style, but mounts differently) bought a cheap one to have on hand
- 86-87 ATC125M
- 86-88 TRX200SX
H4 Style
33130-950-013 (H4 style)
- 81-82 ATC250R
- 80 FL250 Odyssey
33120-965-003 (H4 style)
- 83-85 ATC200X
33120-964-003 (H4 style)
- 83-84 ATC250R
33100-HA0-003 (H4 style)
- 85-87 ATC250ES
33120-HA2-003 (H4 style)
- 85 ATC250SX
- 85 ATC250R
33120-HA2-671 (H4 style)
- 86-87 ATC200X
- 86 ATC250R
- 86-87 ATC250SX
NON-ATC Parts
350x style sockets
33130-HA7-751 - Lower helper lights (350x style)
- 87-89 TRX350D
White Plastic Style
33130-950-003 (White plastic style I think)
- 77-79 FL250 Odyssey
33130-VM5-003 (white plastic style?)
- 84 TRX200
33130-HA8-003 (white plastic style)
- 85-87 TRX250
33130-HC3-000 (white plastic style)
- 87-88 TRX125
Others
33250-HA7-671 - Lower helper lights (T10 rubber socket style I think)
- 86-87 TRX350
H4 Style
33120-HC0-003 (H4 style)
- 87-92 TRX250X
- 92-2006 TRX300EX
33120-HB9-771 (H4 style)
88-89 TRX250R
33120-HB9-003 (H4 style)
- 86-87 TRX250R
33120-HA7-670 & 33120-HA7-671 (H4 style)
- 86-87 TRX350
- 88-89 TRX350D
33120-950-013 (H4 style)
- 81-84 FL250 Odyssey