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Wheel Studs and lug nuts for Datsun 1200 are M12x1.25 thread. Nuts are 19mm hex head (~3/4 inch).

Discussion: extra long wheel stud info

1 Specifications
- 1.1 Front, Disc Brakes
- 1.2 Rear
2 Part Numbers
3 Nuts

Specifications

Thread: M12 x 1.25

Front, Disc Brakes

Head Code: 240
Knurl Diameter: 13.00mm
Thread Pitch: Right
Shoulder Length: 10mm
Thread Size: M12-1.25
Length: 32mm
Type: Serrated Stud

Rear

Nissan Part Number 40222-18000 BOLT-HUB ROAD WHEEL (B110 & B120)
Head Code: 242
Knurl Diameter: 12.56mm
Thread Pitch: Right
Shoulder Length: 11.5mm
Thread Size: M12-1.25
Length: 37.5mm
Type: Serrated Stud w/Clip Head

Part Numbers

Front, Drum Brakes

40222-18000 BOLT-hub (for front drum brake)

Front, Disc Brakes

Nissan 40222-22001 BOLT-hub (for disc brake)
Dorman 28321 (Head Code N)
Dorman 610-240 (610240)/610-2401/98320/983201

Stock Fits

1971-1973 Datsun 1200
1980-1981 Datsun 810
1970 Datsun 2000
1974-1975 Datsun B210
1984-1986 Nissan 200SX
1986-1994 Nissan D21 Pickup
1979-1982 Datsun 210
1976-1978 Datsun F10
1970-1973 Datsun 240Z
1998 Nissan Frontier
1974-1975 Datsun 260Z
1982-1984 Datsun Maxima
1975-1978 Datsun 280Z
1987-2006 Nissan Pathfinder
1979-1983 Datsun 280ZX
1995-1997 Nissan Pickup
1984-1986 Nissan 300ZX
1983 Nissan Pulsar
1968-1973 Datsun 510
1983-1986 Nissan Pulsar NX
1973 Datsun 610
1982-1986 Nissan Sentra
1977-1979 Datsun 620
1982-1986 Nissan Stanza
1980-1986 Datsun 720
2000-2006 Nissan Xterra
1997-2003 Infiniti QX4

Head Code N Fits

1972-1973 Datsun 1200
1984-1988 Nissan 200SX
1986 Nissan 720 Pickup
1986-1993 Nissan D21 Pickup
1987-1993 Nissan Pathfinder

Extra Long

NISMO 40222-A0220 [2" long/51mm]
- For A-series front, 510, rear of FWD models, many more

Would this work? 12.9 instead of 13.0 mm knurl. The 510 and Z-car guys use them to replace the front lugs (which are the same as B110).

* 40222-15C01 GC22 Van $2.12 USD each
* 43222-0B001 V40 Quest $9.47 USD each
* NAPA/Balkamp 6412785 $2.29 USD each 
* Dorman 610-403 (610403) $1.34 Rockauto
Type: Serrated Stud 
Thread: M12-1.25 
Knurl Dia.: 12.90mm 
Length: 45.5mm 
Shoulder Length: 15mm 
* Infiniti J30 front 1995-93
* Nissan VAN Front 1988-87, From 1/88
* Nissan QUEST Rear 1998-93, From 1/88

Rear

NOTE: Fits B110, B120, B210, B310. Also B110 front drum

For H145, H150 and H165

* Nissan 40222-18000 BOLT-HUB ROAD WHEEL (B110 & B120) $3.60 USD
* Dorman 98340/983401/610242
* Dorman 28340 (Head Code D.4.0)
* NISMO 40222-H5020 [2" long/51mm]
* Wagner BD60951 [non-knurled]
* Raybestos 9340B [non-knurled]

Nuts

Lug Nuts for steel wheels

Nissan 40225-27700 NUT-ROAD WHEEL
NISMO 40224-R1120 NUT/TAPERED
RAYBESTOS Professional Grade 10018N

Dorman 711406 AutoGrade/RB 711-406-005 Open End-Bulge Seat
Dorman 611064 Autograde/RB 2029933 (09140-12026, 09159-12020, 28171XA00A, 30015781, 40225-27700, 6230 06002, 6230 06003)
- Standard Open Nut
- Thread M12-1.25
- Hex Size 19mm
- Length 16mm
- Seat Angle 60 deg.
- Finish Chrome
Dorman 611174 AutoGrade/RB 611-174-006 Acorn, Bulge Seat, Hex Size E
Dorman 611099 AutoGrade/RB 611-099-006 Acorn, Hex Size A, 1-pc

40224-21001 B310
40224-21001 B310
40224-M7200 B310 Acorn style
40224-M7210 B310 Acorn style

ALLOY WHEELS
NISMO 40224-E7200 NUT/SQUARE SHOULDER
- For most alloy wheels. Shank: 19mm (0.748"), Length: 14mm (0.551")
40224-R4626 NUT SET-WITH LOCK (FOR ALMI) B310
40224-R4670 NUT-ROAD WHEEL,FOR ALUMINIUM B310
Dorman 611103 AutoGrade/RB kit611-103 Mag-Short Shank
Dorman 611107 AutoGrade/RB 611-107-006 Mag-Standard (2 pc. construction)

Alternatives

Reportedly fit 1200 disk brakes.

S13 (1989-1994 Silvia) Studs:

Dorman 610320/98350/983501/983551 (S13 Rear & Front, flat head)
- Head Code: 320 (19mm diameter?)
- Knurl Diameter: 12.83mm
- Thread Pitch: Right
- Shoulder Length: 14mm
- Thread Size: M12-1.25
- Length: 41.5mm (~47mm overall)
- Type: Serrated Stud

Fits: Most Datsun/Nissan 1970-2006

Also see: Dorman 28355 (Head Code NS, rounded), somem Datsun/Nissan including S13.

Extra-long Repco Stud S4570:

77mm long overall
72mm long minus head
19mm dia head
Use with Repco Nut: NN421

SSR Mark I and Mark II

SpeedStar Wheels Mark 1 or Mark 2 requires a special nut. Imported from Japan. About $5 each in USA (includes washer). MK-I or MK-II M12 x 1.25, they are NOT tapered, but are shank nuts, although a different diameter than most.

USA: http://www.more-japan.com/ssr-mk-i-mk-ii-lug-nut-m12x1.5-w-washer.html