The kit finally arrived, and yes it will work on the 1200 (B110) model without any modifications whatsoever. It uses the same rod diameter and locking nut thread sizes. I have included the instruction sheet that they provided for installations on the 510, 610, 710, and B210 models. These instructions can also be used for the B110. BTW, the steel measuring gauge dimension is 57.5mm. If your kit was supplied without the gauge, you can use a set of calipers instead to measure the distance between the large washers to set the correct preload on the bushing assembly.

BTW,there is a slight modification that is required. It's very simple. The large washer that fits behind the front bushing (against the tension rod bracket welded to the car) is just a bit too small for the kit's plastic piece. A simple fix is to remove that washer (it's spot welded at 2 places, very easy to remove) and replace it with one from a 510 or B210. If you don't want to change the stock washer and have access to a lathe, turn the plastic OD of 41 mm down to 37.5 mm and it will fit nicely against the stock 1200 washer. Attached is a picture showing the complete setup on the bench. Keep in mind that on the picture, the car bracket would be located between the two larger washers in the middle of the assembly.

Attached is a photo after the kit is installed. All what is left is to fit the rubber boot over the front part of the assembly.

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I guess there's only one way to find out and that is to order the kit and see if it will work. There can't be that much difference between the B110/1200 and the B210 setup. If it fits, it might be a good source for other 1200 owners to upgrade. If not, I can always sell to other Datsun owners in my area. I'll keep you posted.

I don't know if it will work on the 1200. The kit instructions list a lot of Datsuns but not the 1200

So, it's confirmed then that the kit shown on www.thezstore.com will indeed work on the 1200.
I'll place the order and get my old hard rubber bushings replaced as they're all starting to split.
For the rear rubber bushing, will it be better to go with the stock rubber bushing or a harder rubber bushing that was listed in the old Datsun 1200 suspension modification book?

Here is what Datsun racing dept. recommended for the Datsun 1200. Not a product kit (a la Nissan Competition) but instead an effective stiffer bushings: Tension Rod and Bushing Modification

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Yes, same as Z car, it replaces the flex point -- which is the end of the rod away from the A arm

notice the list of cars. Basically everything except B110

That's great to hear.
So, for the B110 tension rod setup that is mounted ahead of the LCA and towards the front of the car, the kit ball/cup assembly would replace the front rubber bushing that is closest to the threaded nut near the end of the rod. Is that correct?

Nissan Competition used to sell that. See our article: Tension Rods
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Thanks for the information. That's one part of the puzzle solved.
On the 1200 the rod diameter is close to 0.5 inch and the collar OD is about 5/8".
So, if the bushing OD is similar between the 1200 and the 280ZX, then I would presume that the ball/cut kit probably would work in the 1200.

Because it's been literally 26 years since I converted my car over to the ubiquitous 280ZX front suspension I can't remember if the 1200 radius rods bushings have a different inside diameter. I can tell you the 280zx bushings outside diameter is such that the fit in the 1200 chassis.