The Datsun 1200 strut top is a rubber insulator for the the strut, and utilizes a bearing for easy rotation for the steering system. Most aftermarket adjustable strut tops do not include an insulator, so are not recommended for a street or off-road vehicle.
Stock 1200 strut tops protrude above the tower:
The stock tops are non-adjustable regarding Wheel alignment.
The Datsun Competition suspension manual recommends slotting the tower bolt holes for camber adjusability:
See main article: Camber
Aftermarket strut tops are adjustable in one or two dimensions. Unfortunately, most do not include an insulator and so will transmit shock and vibration to the body.
Bolt circle: 123mm
Adjustable strut tops are often available on eBay, or some buy them from TRD. Most Datsun/Nissan use the same bolt circle, but some use larger diameter bolts or larger strut shaft diameter (modify as necessary):
* eBay * TRD * Cusco
54320-H1000 INSULATOR-STRUT MOUNTING (2) 08915-53810 WASHER-PLAIN M8 (6) 08915-13810 WASHER-SPRING M8 (6) 6 08911-10810 NUT-HEX M8X1.25 (6) 6 54325-H1000 BEARING-STRUT MOUNTING (2)
Strut tops: B210 (left) vs B110 (right)
The B110 strut tops are different from B210 & B310 tops. They latter have a higher profile and raise the car up, so use the B110 tops. If there is nothing poking up through the hole in the strut tower,then it's "wrong" for a 1200.
TIP: You can use rubber covers from an early 90's Mazda 323 w/ electric adjustable suspension. Thse covers sits perfectly over a 1200 strut tower, even with large 1200 strut tops or camber-adjustable strut tops.