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As you can see, I'm not alone

Taking about availability of Datsun parts not only in Belgium but in nearly hole Europe, it is = 0
All Datsun and Toyotas have been sold to Africa regardless of rust, engine damage, missing parts. Africa took it all.
Only way to get a Datsun is buy one where they are still running for exemple PORTUGAL. You can compare it a bit to California, US. Much sun, few humidity, no salt against snow. Even better are cars from the isle of Madeira. That is were I bought my 2 B110 2door and 1 510 4door.

So if you need much parts for a conversion/swap you take it from another cars you bought before or you just buy a new ones.

You're right I had 910 still as NOS in my warehouse.

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This Is a fine description of what I was worried about. If the ride height is not good, if I have to lower the car a bit more.....what happens to my spring?....not enough preload! As I will work with height ajustable spring perches

I could use a helper spring to give enough preload at full suspension travel. But before using a helper, you have to choose the right main spring. That is what all this topic is about.

And don't forget I will use a SR20DET, so a 1200 aftermarket sport spring will compress to much under the more weight of the SR20DET. At least that is what I suppose.
Butr at least I know now that I have to start with 240Z shocks.
It seems that Tokico Illuminas are preferable to the Koni's as I read on the 510 mailing list.
Thanks to all,
Chris
To all 910 strut user keep the forum updated about your experience