Hi Mick
You will find the springs settle once the body is on. Do not try to attach the check straps until then and, as already mentioned by others, don;t finally tighten the eye bolts until the weight if the car is on the springs. I seem to remember having to use an extra washer or two to get the Spax dampers aligned but I think they reached (just).
Chris H

Chris,
Thanks - your website mentions replacement brackets at the top and modified brackets at the bottom. Did you not use the existing lower brackets?

I seem to remember using ones supplied by NG. The only difference being that they have additional brackets for an anti-tramp bar but I am not using them anyway. I think they are otherwise the same as the standard ones.
Chris H