YES. Look at post #12 in this thread.
Look at post #13 in this thread where I asked for verification.
The point I'm trying to make ( in laboriously typing out all those specs from the factory service manual for the UK & European '260Z' variants ) is that knowing the OEM spring lengths will enable you to understand the springs you originally had. As far as I can see, they are your only positive datum points at this time.
Yes, it appears so if the strut tubes are different.
The reason I'm making the point that the term "240Z lowering springs" is meaningless is because there's not one single model of "240Z" and there was big variation in both springs and struts ( strut differences included different length tubes and different lower spring perch heights ).
In which case, how can spring manufacturers (Eibach, Tokico) sell lowering springs for '240z & 74 260z' and not have a mountain of returned parts that don't fit?
How can you know how to get where you want to go if you don't know where you are?
That was the entire point of having them made by a specialist company. First time around they told Mike they had the correct specs. In their defence Mike suggested I send the springs off the car but I didn't as I wasn't sure if I was going to have to move it anytime soon but they came up with 'correct specs' so Mike authorised manufacture. After that was a disaster I sent both my front springs and one of my rears as was requested to start with and they still got it completely wrong.
I've never looked in a Haynes manual for the cars, but I'm surprised yours lists the "US" spring data. Is it the Haynes manual for the "US" models, then? No wonder you are confused ( and I am too.... ).
The Haynes book says nothing about being specific to any particular market, but it lists
HLS30-U
HLS 30
HS3OU
RLS30OU
RLS30UN
RLS30AU
RLS30AUN
none of which match my RS30. Seeing as most specs anywhere
are per the US model and there is only one spring spec in the Haynes, I assume it is likely a US spec.
So ( unless its a secret ) what are the coil counts and free lengths of the 'original' springs that came off your car, and what are the ( Nissan ) part numbers on your front and rear strut tubes?
I could only find one spring in the storage room as it's pitch black, and there's no light in there. The spring has 10.65 coils and is 15" long.
Where are the part numbers on the strut tubes, I don't remember seeing any?
I wasn't saying it defintely was, just that it's something that should be taken into account. I can understand your frustration, but please don't throw good information, given with good intent, back in the faces of people who are trying to help you.
I'm not 'throwing it back in the faces of people who are trying to help', if you expect me to blindly follow everything anyone says on the internet without question then what? It's not like I started by calling your post 'depressing'...